Updated on 2024/03/30

写真a

 
KAWAGUCHI Yuki
 
Organization
Graduate School of Engineering Applied Physics 1 Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Physical Science and Engineering
Title
Professor

Degree 1

  1. Doctor (Science) （ 2005.3   Kyoto University ） 

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Research Interests 3

  1. topological structures

  2. cold atomic physics

  3. condensed-matter physics

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Research Areas 1

  1. Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

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Research History 8

  1. Nagoya University   Department of Applied Physics   Professor

    2020.5

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    Country：Japan

  2. Nagoya University   Department of Applied Physics   Associate professor

    2017.4 - 2020.4

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    Country：Japan

  3. Nagoya University   Department of Applied Physics   Associate professor

    2015.9 - 2017.3

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    Country：Japan

  4. The University of Tokyo   Department of Applied Physics, School of Engineering   Lecturer

    2014.4 - 2015.9

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    Country：Japan

  5. The University of Tokyo   Department of Applied Physics and Quantum-Phase Electronics Center   Designated associate professor

    2012.7 - 2014.3

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    Country：Japan

  6. The University of Tokyo   Department of Physics, Graduate School of Science   Assistant Professor

    2008.5 - 2012.7

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    Country：Japan

  7. Tokyo Institute of Technology   Department of Physics   Assistant Professor

    2007.1 - 2008.4

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    Country：Japan

  8. Tokyo Institute of Technology   Department of Physics   JSPS research fellow

    2005.4 - 2006.12

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    Country：Japan

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Education 2

  1. Kyoto University   Graduate School, Division of Natural Science   Department of Physics

    2000.4 - 2005.3

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    Country： Japan

  2. Kyoto University   Faculty of Science

    1996.4 - 2000.3

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    Country： Japan

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Professional Memberships 1

  1. The Physical Society of Japan

    2002

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Committee Memberships 9

  1. The 29th IUPAP International Conference on Statistical Physics (STATPHYS29)   International Advisory Committee member  

    2024.2 - 2025.7   

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    Committee type：Academic society

  2. Quantum Fluids and Solids (QFS2024) meeting   International Advisory Committee member  

    2023.11 - 2024.8   

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    Committee type：Academic society

  3. 日本物理学会   代議員  

    2023.4 - 2025.3   

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    Committee type：Academic society

  4. Quantum Fluids and Solids (QFS2023) meeting   International Advisory Committee member  

    2022.11 - 2023.8   

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    Committee type：Academic society

  5. 日本物理学会名古屋支部   支部役員  

    2022.4 - 2024.3   

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    Committee type：Academic society

  6. The 28th IUPAP International Conference on Statistical Physics (STATPHYS28)   International Advisory Committee member  

    2018.5 - 2023.8   

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    Committee type：Academic society

  7. Quantum Fluids and Solids (QFS2019) meeting   International Program Advisory Committee member  

    2018.5 - 2019.8   

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    Committee type：Academic society

  8. Quantum Fluids and Solids (QFS2018) meeting   International Program Advisory Committee member  

    2018.1 - 2018.8   

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    Committee type：Academic society

  9. 29th International Conference on Low Temperature Physics (LT29)   Executive Committee Member  

    2016.12 - 2020.12   

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    Committee type：Academic society

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Awards 7

  1. 科学技術分野の文部科学大臣表彰　科学技術賞（研究部門）

    2023.4   文部科学省   内部自由度を持った冷却原子気体の理論研究

    川口由紀

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

  2. 米沢富美子記念賞

    2020.3   日本物理学会   内部自由度を持った原子気体ボース・アインシュタイン凝縮体の理論研究

    川口由紀

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

  3. 久保亮五記念賞

    2017.10   井上科学振興財団   内部自由度を持った冷却原子気体の理論研究

    川口由紀

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

  4. 科学技術分野の文部科学大臣表彰 若手科学者賞

    2015.4   文部科学省   スピン自由度を持った冷却原子気体の研究

    川口由紀

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

  5. ⼥性研究者トップリーダー顕彰

    2022.10   名古屋大学   スピン自由度を持った冷却原子気体の理論研究

    川口由紀

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    Country：Japan

  6. 井上リサーチアウォード

    2012.2   井上科学振興財団   スピノールBECにおける量子多体効果の研究

    川口由紀

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

  7. 日本物理学会若手奨励賞 領域１

    2008.3   日本物理学会   スピノール・ダイポールBECの理論的研究

    川口由紀

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Papers 73

  1. Spinor Bose-Einstein condensates Invited Reviewed

    Yuki Kawaguchi, Masahito Ueda

    PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS   Vol. 520 ( 5 ) page： 253 - 381   2012.11

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    states feel the Lorentz-like forces in the opposite directions. This is the origin for the emergence of the spin Hall effect. We define the mass-current and spin-current operators from the equations of continuity and calculate the spin Hall conductivity from the off-diagonal current-current correlation function within the Bogoliubov approximation. We find that the correction of the current operators due to the MDDI significantly contributes to the spin Hall conductivity. A possible experimental situation is also discussed.

    DOI： 10.1016/j.physrep.2012.07.005

    Web of Science

  2. Designing nontrivial one-dimensional Floquet topological phases using a spin-1/2 double-kicked rotor Reviewed

    Koyama, Y; Fujimoto, K; Nakajima, S; Kawaguchi, Y

    PHYSICAL REVIEW RESEARCH   Vol. 5 ( 4 )   2023.11

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevResearch.5.043167

    Web of Science

  3. Nuclear spin relaxation rate of nonunitary Dirac and Weyl superconductors Reviewed

    Koki Maeno, Yuki Kawaguchi, Yasuhiro Asano, Shingo Kobayashi

    PHYSICAL REVIEW B   Vol. 107 ( 6 ) page： 064511   2023.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevB.107.064511

    Web of Science

  4. Impact of Dissipation on Universal Fluctuation Dynamics in Open Quantum Systems Reviewed

    Fujimoto Kazuya, Hamazaki Ryusuke, Kawaguchi Yuki

    PHYSICAL REVIEW LETTERS   Vol. 129 ( 11 ) page： 110403   2022.9

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.129.110403

    Web of Science

    PubMed

  5. Controllable interskyrmion attractive interactions and resulting skyrmion-lattice structures in two-dimensional chiral magnets with in-plane anisotropy Reviewed

    Kameda Mai, Koyama Rio, Nakajima Takuro, Kawaguchi Yuki

    PHYSICAL REVIEW B   Vol. 104 ( 17 ) page： 174446   2021.11

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevB.104.174446

    Web of Science

  6. Spin-wave growth via Shapiro resonances in a spinor Bose-Einstein condensate Reviewed

    Imaeda, Yuya; Fujimoto, Kazuya; Kawaguchi, Yuki

    Physical Review Research   Vol. 3 ( 4 ) page： 043090   2021.10

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevResearch.3.043090

    Web of Science

  7. Dynamical Scaling of Surface Roughness and Entanglement Entropy in Disordered Fermion Models Reviewed

    Fujimoto Kazuya, Hamazaki Ryusuke, Kawaguchi Yuki

    PHYSICAL REVIEW LETTERS   Vol. 127 ( 9 ) page： 090601   2021.8

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    DOI： 10.1103/PhysRevLett.127.090601

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    PubMed

  8. Observation of domain wall bimerons in chiral magnets Reviewed

    Nagase Tomoki, So Yeong-Gi, Yasui Hayata, Ishida Takafumi, Yoshida Hiroyuki K., Tanaka Yukio, Saitoh Koh, Ikarashi Nobuyuki, Kawaguchi Yuki, Kuwahara Makoto, Nagao Masahiro

    NATURE COMMUNICATIONS   Vol. 12 ( 1 ) page： 3490   2021.6

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    DOI： 10.1038/s41467-021-23845-y

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    PubMed

  9. Perfect Transmission and Perfect Reflection of Bogoliubov Quasiparticles in a Dynamically Unstable Bose-Einstein Condensate Reviewed

    Ohashi Terumichi, Kawaguchi Yuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 90 ( 3 )   2021.3

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    DOI： 10.7566/JPSJ.90.034501

    Web of Science

  10. Visible stripe phases in spin-orbital-angular-momentum coupled Bose-Einstein condensates Reviewed International coauthorship

    Chiu N-C, Kawaguchi Y., Yip S-K, Lin Y-J

    NEW JOURNAL OF PHYSICS   Vol. 22 ( 9 )   2020.9

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    DOI： 10.1088/1367-2630/abac3c

    Web of Science

  11. Family-Vicsek Scaling of Roughness Growth in a Strongly Interacting Bose Gas Reviewed

    Fujimoto Kazuya, Hamazaki Ryusuke, Kawaguchi Yuki

    PHYSICAL REVIEW LETTERS   Vol. 124 ( 21 )   2020.5

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    DOI： 10.1103/PhysRevLett.124.210604

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  12. Scale-invariant relaxation dynamics in two-component Bose-Einstein condensates with large particle-number imbalance Reviewed

    Fujimoto Kazuya, Haneda Kazunori, Kudo Kazue, Kawaguchi Yuki

    PHYSICAL REVIEW A   Vol. 101 ( 2 )   2020.2

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    DOI： 10.1103/PhysRevA.101.023608

    Web of Science

  13. Generalized Berry phase for a bosonic Bogoliubov system with exceptional points Reviewed

    Ohashi Terumichi, Kobayashi Shingo, Kawaguchi Yuki

    PHYSICAL REVIEW A   Vol. 101 ( 1 )   2020.1

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    DOI： 10.1103/PhysRevA.101.013625

    Web of Science

  14. Smectic Liquid-Crystalline Structure of Skyrmions in Chiral Magnet Co8.5Zn7.5Mn4(110) Thin Film Reviewed

    Nagase T., Komatsu M., So Y. G., Ishida T., Yoshida H., Kawaguchi Y., Tanaka Y., Saitoh K., Ikarashi N., Kuwahara M., Nagao M.

    PHYSICAL REVIEW LETTERS   Vol. 123 ( 13 )   2019.9

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    DOI： 10.1103/PhysRevLett.123.137203

    Web of Science

    PubMed

  15. Theory of the Josephson current on a magnetically doped topological insulator Reviewed

    Toki Tsubasa, Nakosai Sho, Tanaka Yukio, Kawaguchi Yuki

    PHYSICAL REVIEW B   Vol. 100 ( 10 )   2019.9

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    DOI： 10.1103/PhysRevB.100.104518

    Web of Science

  16. Spin-orbit coupling induced valley Hall effects in transition-metal dichalcogenides Reviewed International coauthorship

    Zhou Benjamin T., Taguchi Katsuhisa, Kawaguchi Yuki, Tanaka Yukio, Law K. T.

    COMMUNICATIONS PHYSICS   Vol. 2   2019.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s42005-019-0127-7

    Web of Science

  17. Axion Instability and Nonlinear Electromagnetic Effect Reviewed

    Imaeda Tatsushi, Kawaguchi Yuki, Tanaka Yukio, Sato Masatoshi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 88 ( 2 )   2019.2

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    DOI： 10.7566/JPSJ.88.024402

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  18. Rotating Atomic Quantum Gases with Light-Induced Azimuthal Gauge Potentials and the Observation of the Hess-Fairbank Effect Reviewed International coauthorship

    P.-K. Chen, L.-R. Liu, M.-J. Tsai, N.-C. Chiu, Y. Kawaguchi, S.-K. Yip, M.-S. Chang, Y.-J. Lin

    Physical Review Letters   Vol. 121 ( 25 )   2018.12

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    We demonstrate synthetic azimuthal gauge potentials for Bose-Einstein condensates from engineering atom-light couplings. The gauge potential is created by adiabatically loading the condensate into the lowest energy Raman-dressed state, achieving a coreless vortex state. The azimuthal gauge potentials act as effective rotations and are tunable by the Raman coupling and detuning. We characterize the spin textures of the dressed states, in agreements with the theory. The lowest energy dressed state is stable with a 4.5-s half-atom-number-fraction lifetime. In addition, we exploit the azimuthal gauge potential to demonstrate the Hess-Fairbank effect, the analogue of Meissner effect in superconductors. The atoms in the absolute ground state has a zero quasiangular momentum and transits into a polar-core vortex when the synthetic magnetic flux is tuned to exceed a critical value. Our demonstration serves as a paradigm to create topological excitations by tailoring atom-light interactions where both types of SO(3) vortices in the
    F=1 manifold, coreless vortices and polar-core vortices, are created in our experiment. The gauge field in the stationary Hamiltonian opens a path to investigating rotation properties of atomic superfluids under thermal equilibrium.

    DOI： 10.1103/PhysRevLett.121.250401

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    PubMed

  19. Spin-Orbital-Angular-Momentum Coupled Bose-Einstein Condensates Reviewed International coauthorship

    H.-R. Chen, K.-Y. Lin, P.-K. Chen, N.-C. Chiu, J.-B. Wang, C.-A. Chen, P.-P. Huang, S.-K. Yip, Yuki Kawaguchi, Y.-J. Lin

    PHYSICAL REVIEW LETTERS   Vol. 121 ( 11 )   2018.9

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    We demonstrate coupling between the atomic spin- and orbital-angular momentum (OAM) of the atom's center-of-mass motion in a Bose-Einstein condensate (BEC). The coupling is induced by Raman-dressing lasers with a Laguerre-Gaussian beam and creates coreless vortices in an F=1 87Rb spinor BEC. We observe correlations between spin and OAM in the dressed state and characterize the spin texture; the result is in good agreement with the theory. In the presence of the Raman field, our dressed state is stable for 0.1 s or longer, and it decays due to collision-induced relaxation. As we turn off the Raman beams, the vortex cores in the bare spin |mF=1> and |-1> split. These spin-OAM coupled systems with the Raman-dressing approach have great potential for exploring new topological textures and quantum states.

    DOI： 10.1103/PhysRevLett.121.113204

    Web of Science

    PubMed

  20. Valley Edelstein effect in monolayer transition-metal dichalcogenides Reviewed International coauthorship

    K. Taguchi, B. T. Zhou, Y. Kawaguchi, Y. Tanaka, K. T. Law

    PHYSICAL REVIEW B   Vol. 98 ( 3 )   2018.7

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    We predict the emergence of the valley Edelstein effect (VEE), which is an electric-field-induced spin-polarization effect, in gated monolayer transition-metal dichalcogenides (MTMDs). We found an unconventional valley-dependent response in which the spin polarization is parallel to the applied electric field with opposite spin polarization generated by opposite valleys. This is in sharp contrast to the conventional Edelstein effect in which the induced spin polarization is perpendicular to the applied electric field. We identify the origin of VEE as combined effects of conventional Edelstein effect and valley-dependent Berry curvatures induced by coexisting Rashba and Ising spin-orbit couplings in gated MTMDs. Experimental schemes to detect the VEE are also considered.

    DOI： 10.1103/PhysRevB.98.035435;035435

    Web of Science

  21. Local density of states in two-dimensional topological superconductors under a magnetic field: Signature of an exterior Majorana bound state Reviewed

    Shu-Ichiro Suzuki, Yuki Kawaguchi, Yukio Tanaka

    PHYSICAL REVIEW B   Vol. 97 ( 14 )   2018.4

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    We study quasiparticle states on a surface of a topological insulator (TI) with proximity-induced superconductivity under an external magnetic field. An applied magnetic field creates two Majorana bound states: a vortex Majorana state localized inside a vortex core and an exterior Majorana state localized along a circle centered at the vortex core. We calculate the spin-resolved local density of states (LDOS) and demonstrate that the shrinking of the radius of the exterior Majorana state, predicted in R. S. Akzyanov et al., Phys. Rev. B 94, 125428 (2016), under a strong magnetic field can be seen in LDOS without smeared out by nonzero-energy states. The spin-resolved LDOS further reveals that the spin of the exterior Majorana state is strongly spin-polarized. Accordingly, the induced odd-frequency spin-triplet pairs are found to be spin-polarized as well. In order to detect the exterior Majorana states, however, the Fermi energy should be closed to the Dirac point to avoid contributions from continuum levels. We also study a different two-dimensional topological-superconducting system where a two-dimensional electron gas with the spin-orbit coupling is sandwiched between an s-wave superconductor and a ferromagnetic insulator. We show that the radius of an exterior Majorana state can be tuned by an applied magnetic field. However, on the contrary to the results at a TI surface, neither the exterior Majorana state nor the induced odd-frequency spin-triplet pairs are spin-polarized. We conclude that the spin polarization of the Majorana state is attributed to the spin-polarized Landau level, which is characteristic for systems with the Dirac-like dispersion.

    DOI： 10.1103/PhysRevB.97.144516

    Web of Science

  22. Geometrically frustrated coarsening dynamics in spinor Bose-Fermi mixtures Reviewed

    Nguyen Thanh Phuc, Tsutomu Momoi, Shunsuke Furukawa, Yuki Kawaguchi, Takeshi Fukuhara, Masahito Ueda

    Physical Review A   Vol. 95 ( 1 )   2017.1

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    Coarsening dynamics theory describes equilibration of a broad class of systems. By studying the relaxation of a periodic array of microcondensates immersed in a Fermi gas, which mediates long-range spin interactions to simulate frustrated classical magnets, we show that coarsening dynamics can be suppressed by geometrical frustration. The system is found to eventually approach a metastable state which is robust against random field noise and characterized by finite correlation lengths together with the emergence of topologically stable Z2 vortices. We find universal scaling laws with no thermal-equilibrium analog that relate the correlation lengths and the number of vortices to the degree of frustration in the system.

    DOI： 10.1103/PhysRevA.95.013620

    Web of Science

  23. Spin and charge transport induced by a twisted light beam on the surface of a topological insulator Reviewed

    Kunitaka Shintani, Katsuhisa Taguchi, Yukio Tanaka, Yuki Kawaguchi

    PHYSICAL REVIEW B   Vol. 93 ( 19 )   2016.5

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    We theoretically study spin and charge transport induced by a twisted light beam irradiated on a disordered surface of a doped three-dimensional topological insulator (TI). We find that various types of spin vortices are imprinted on the surface of the TI depending on the spin and orbital angular momentum of the incident light. The key mechanism for the appearance of the unconventional spin structure is the spin-momentum locking in the surface state of the TI. Besides, the diffusive transport of electrons under an inhomogeneous electric field causes a gradient of the charge density, which then induces nonlocal charge current and spin density as well as the spin current. We discuss the relation between these quantities within the linear response to the applied electric field using the Keldysh-Green's function method.

    DOI： 10.1103/PhysRevB.93.195415

    Web of Science

  24. Spin Hall effect in a spinor dipolar Bose-Einstein condensate Reviewed

    Toshiyuki Oshima, Yuki Kawaguchi

    PHYSICAL REVIEW A   Vol. 93 ( 5 )   2016.5

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    We theoretically show that the spin Hall effect arises in a Bose-Einstein condensate (BEC) of neutral atoms interacting via the magnetic dipole-dipole interactions (MDDIs). Since the MDDI couples the total spin angular momentum and the relative orbital angular momentum of two colliding atoms, it works as a spin-orbit coupling. Thus, when we prepare a BEC in a magnetic sublevel m=0, thermally and quantum-mechanically excited atoms in the m=1 and -1 states feel the Lorentz-like forces in the opposite directions. This is the origin for the emergence of the spin Hall effect. We define the mass-current and spin-current operators from the equations of continuity and calculate the spin Hall conductivity from the off-diagonal current-current correlation function within the Bogoliubov approximation. We find that the correction of the current operators due to the MDDI significantly contributes to the spin Hall conductivity. A possible experimental situation is also discussed.

    DOI： 10.1103/PhysRevA.93.053605

    Web of Science

  25. Skyrmionic magnetization configurations at chiral magnet/ferromagnet heterostructures Reviewed

    Yuki Kawaguchi, Yukio Tanaka, and Naoto Nagaosa

    PHYSICAL REVIEW B   Vol. 93 ( 6 )   2016.2

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    We consider magnetization configurations at chiral magnet (CM)/ferromagnet (FM) heterostructures. In the CM, magnetic skyrmions and spin helices emerge due to the Dzyaloshinskii-Moriya interaction, which then penetrate into the adjacent FM. However, because the nonuniform magnetization structures are energetically unfavorable in the FM, the penetrated magnetization structures are deformed, resulting in exotic three-dimensional configurations, such as skyrmion cones, sideways skyrmions, and twisted helices and skyrmions. We discuss the stability of possible magnetization configurations at the CM/FM and CM/FM/CM hybrid structures within the framework of the variational method, and find that various magnetization configurations appear in the ground state, some of which cause nontrivial emergent magnetic field.

    DOI： 10.1103/PhysRevB.93.064416

    Web of Science

  26. Controlling and probing non-abelian emergent gauge potentials in spinor Bose-Fermi mixtures Reviewed

    Nguyen Thanh Phuc, Gen Tatara, Yuki Kawaguchi, Masahito Ueda

    NATURE COMMUNICATIONS   Vol. 6   2015.9

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    Gauge fields, typified by the electromagnetic field, often appear as emergent phenomena due to geometrical properties of a curved Hilbert subspace, and provide a key mechanism for understanding such exotic phenomena as the anomalous and topological Hall effects. Non-abelian gauge potentials serve as a source of non-singular magnetic monopoles. Here we show that unlike conventional solid materials, the non-abelianness of emergent gauge potentials in spinor Bose-Fermi atomic mixtures can be continuously varied by changing the relative particle-number densities of bosons and fermions. The non-abelian feature is captured by an explicit dependence of the measurable spin current density of fermions in the mixture on the variable coupling constant. Spinor mixtures also provide us with a method to coherently and spontaneously generate a pure spin current without relying on the spin Hall effect. Such a spin current is expected to have potential applications in the new generation of atomtronic devices.

    DOI： 10.1038/ncomms9135

    Web of Science

  27. Coarsening dynamics driven by vortex-antivortex annihilation in ferromagnetic Bose-Einstein condensates Reviewed

    Kazue Kudo, Yuki Kawaguchi

    PHYSICAL REVIEW A   Vol. 91 ( 5 )   2015.5

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    In ferromagnetic Bose-Einstein condensates (BECs), the quadratic Zeeman effect controls magnetic anisotropy, which affects magnetic domain pattern formation. While the longitudinal magnetization is dominant (similar to the Ising model) for a negative quadratic Zeeman energy, the transverse magnetization is dominant (similar to the XY model) for a positive one. When the quadratic Zeeman energy is positive, the coarsening dynamics is driven by vortex-antivortex annihilation in the same way as the XY model. However, due to a superfluid flow of atoms, there exist several combinations of vortex-antivortex pairs in ferromagnetic BECs, which makes the coarsening dynamics more complicated than that of the XY model. We propose a revised domain growth law, which is based on the growth law of the two-dimensional XY model, for a two-dimensional ferromagnetic BEC with a positive quadratic Zeeman energy.

    DOI： 10.1103/PhysRevA.91.053609

    Web of Science

  28. Quantum Mass Acquisition in Spinor Bose-Einstein Condensates Reviewed

    Nguyen Thanh Phuc, Yuki Kawaguchi, and Masahito Ueda

    PHYSICAL REVIEW LETTERS   Vol. 113 ( 23 )   2014.12

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    Quantum mass acquisition, in which a massless (quasi)particle becomes massive due to quantum corrections, is predicted to occur in several subfields of physics. However, its experimental observation remains elusive since the emergent energy gap is too small. We show that a spinor Bose-Einstein condensate is an excellent candidate for the observation of such a peculiar phenomenon as the energy gap turns out to be 2 orders of magnitude larger than the zero-point energy. This extraordinarily large energy gap is a consequence of the dynamical instability. The propagation velocity of the resultant massive excitation mode is found to be decreased by the quantum corrections as opposed to phonons.

    DOI： 10.1103/PhysRevLett.113.230401

    Web of Science

  29. Goldstone-mode instability leading to fragmentation in a spinor Bose-Einstein condensate Reviewed

    Yuki Kawaguchi

    PHYSICAL REVIEW A   Vol. 89 ( 3 )   2014.3

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    We apply the number-conserving Bogoliubov theory to spinor Bose-Einstein condensates and show that the Goldstone magnon causes instability leading to fragmentation. Unlike the dynamical instability, where modes with complex eigenfrequencies grow exponentially, here the zero-energy mode exhibits algebraic growth. We also point out that a small fraction of thermally excited atoms enhances the fragmentation dynamics.

    DOI： 10.1103/PhysRevA.89.033627

    Web of Science

  30. Fluctuation-induced and symmetry-prohibited metastabilities in spinor Bose-Einstein condensates Reviewed

    Nguyen Thanh Phuc, Yuki Kawaguchi, Masahito Ueda

    PHYSICAL REVIEW A   Vol. 88 ( 4 )   2013.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    Spinor Bose-Einstein condensates provide a unique example in which the Bogoliubov theory fails to describe the metastability associated with first-order quantum phase transitions. This problem is resolved by developing the spinor Beliaev theory which takes account of quantum fluctuations of the condensate. It is these fluctuations that generate terms of higher than the fourth order in the order-parameter field which are needed for the first-order phase transitions. Besides the conventional first-order phase transitions which are accompanied by metastable states, we find a class of first-order phase transitions which are not accompanied by metastable states. The absence of metastability in these phase transitions holds to all orders of approximation since the metastability is prohibited by the symmetry of the Hamiltonian at the phase boundary. Finally, the possibility of macroscopic quantum tunneling from a metastable state to the ground state is discussed.

    DOI： 10.1103/PhysRevA.88.043629

    Web of Science

  31. Kibble-Zurek mechanism in a trapped ferromagnetic Bose-Einstein condensate Reviewed

    Hiroki Saito, Yuki Kawaguchi, Masahito Ueda

    JOURNAL OF PHYSICS-CONDENSED MATTER   Vol. 25 ( 40 )   2013.10

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    DOI： 10.1088/0953-8984/25/40/404212

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  32. Magnetic domain growth in a ferromagnetic Bose-Einstein condensate: Effects of current Reviewed

    Kazue Kudo, Yuki Kawaguchi

    PHYSICAL REVIEW A   Vol. 88 ( 1 )   2013.7

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    DOI： 10.1103/PhysRevA.88.013630

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  33. Beliaev theory of spinor Bose-Einstein condensates Reviewed

    Nguyen Thanh Phuc, Yuki Kawaguchi, Masahito Ueda

    ANNALS OF PHYSICS   Vol. 328   page： 158 - 219   2013.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.aop.2012.10.004

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  34. Symmetry classification of spin-orbit-coupled spinor Bose-Einstein condensates Reviewed International coauthorship

    Z. F. Xu, Y. Kawaguchi, L. You, M. Ueda

    PHYSICAL REVIEW A   Vol. 86 ( 3 )   2012.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.86.033628

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  35. Topological classification of vortex-core structures of spin-1 Bose-Einstein condensates Reviewed

    Shingo Kobayashi, Yuki Kawaguchi, Muneto Nitta, Masahito Ueda

    PHYSICAL REVIEW A   Vol. 86 ( 2 )   2012.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.86.023612

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  36. Finite-temperature phase diagram of a spin-1 Bose gas Reviewed International coauthorship

    Yuki Kawaguchi, Nguyen Thanh Phuc, P. Blair Blakie

    PHYSICAL REVIEW A   Vol. 85 ( 5 )   2012.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.85.053611

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  37. Abe homotopy classification of topological excitations under the topological influence of vortices Reviewed

    Shingo Kobayashi, Michikazu Kobayashi, Yuki Kawaguchi, Muneto Nitta, Masahito Ueda

    NUCLEAR PHYSICS B   Vol. 856 ( 2 ) page： 577 - 606   2012.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.nuclphysb.2011.11.003

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  38. Symmetry classification of spinor Bose-Einstein condensates Reviewed

    Yuki Kawaguchi, Masahito Ueda

    PHYSICAL REVIEW A   Vol. 84 ( 5 )   2011.11

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.84.053616

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  39. Effects of thermal and quantum fluctuations on the phase diagram of a spin-1 Rb-87 Bose-Einstein condensate Reviewed

    Nguyen Thanh Phuc, Yuki Kawaguchi, Masahito Ueda

    PHYSICAL REVIEW A   Vol. 84 ( 4 )   2011.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.84.043645

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  40. Dissipative hydrodynamic equation of a ferromagnetic Bose-Einstein condensate: Analogy to magnetization dynamics in conducting ferromagnets Reviewed

    Kazue Kudo, Yuki Kawaguchi

    PHYSICAL REVIEW A   Vol. 84 ( 4 )   2011.10

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.84.043607

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  41. 内部自由度を持ったボース・アインシュタイン凝縮体 : スピノルBECにおけるトポロジカル励起(<シリーズ>超伝導・超流動研究の接点) Invited Reviewed

    川口 由紀

    物性研究   Vol. 95 ( 6 ) page： 543 - 582   2011.3

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    Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

  42. Collision Dynamics of Non-Abelian Vortices in Spinor Bose-Einstein Condensates Reviewed

    Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    JOURNAL OF LOW TEMPERATURE PHYSICS   Vol. 162 ( 3-4 ) page： 299 - 306   2011.2

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  43. Bose-Einstein condensates with magnetic dipole-dipole interactions Invited Reviewed

    Solid state physics   Vol. 46 ( 1 ) page： 21 - 28   2011.1

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

  44. Hydrodynamic equation of a spinor dipolar Bose-Einstein condensate Reviewed

    Kudo Kazue, Kawaguchi Yuki

    PHYSICAL REVIEW A   Vol. 82 ( 5 )   2010.11

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.82.053614

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  45. Spontaneous magnetic ordering in a ferromagnetic spinor dipolar Bose-Einstein condensate Reviewed

    Kawaguchi Yuki, Saito Hiroki, Kudo Kazue, Ueda Masahito

    PHYSICAL REVIEW A   Vol. 82 ( 4 )   2010.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.82.043627

    Web of Science

  46. Non-Abelian Vortices and Their Collision Dynamics in Spinor Bose-Einstein Condensates(Current Topics) Invited Reviewed

    Kobayashi Michikazu, Kawaguchi Yuki, Nitta Muneto, Ueda Masahito

    Butsuri   Vol. 65 ( 8 ) page： 625 - 628   2010.8

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    Bose-Einstein condensates (BECs) with spin degrees of freedom are predicted to realize non-Abelian vortices. Non-Abelian vortices are now studied in various research arenas such as cosmology, high-energy physics, solid-state physics, and soft matter physics. We report the unique collision dynamics of non-Abelian vortices realized in the cyclic phase of a spin-2 spinor BEC.

  47. NEW PHYSICS IN DIPOLAR BOSE-EINSTEIN CONDENSATES

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    LASER SPECTROSCOPY     page： 29 - 38   2010

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

    Web of Science

  48. Topological Excitations in Spinor Bose-Einstein Condensates Reviewed

    Kawaguchi Yuki, Kobayashi Michikazu, Nitta Muneto, Ueda Masahito

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   ( 186 ) page： 455 - 462   2010

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

    Web of Science

  49. Spin-dependent inelastic collisions in spin-2 Bose-Einstein condensates Reviewed

    Tojo Satoshi, Hayashi Taro, Tanabe Tatsuyoshi, Hirano Takuya, Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    PHYSICAL REVIEW A   Vol. 80 ( 4 )   2009.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.80.042704

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  50. Collision Dynamics and Rung Formation of non-Abelian Vortices Reviewed

    Kobayashi Michikazu, Kawaguchi Yuki, Nitta Muneto, Ueda Masahito

    PHYSICAL REVIEW LETTERS   Vol. 103 ( 11 )   2009.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.103.115301

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  51. Spinor Dipolar Bose-Einstein Condensates(Current Topics) Invited Reviewed

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    Butsuri   Vol. 64 ( 8 ) page： 623 - 627   2009.8

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    Magnetic dipole-dipole interaction in atomic Bose-Einstein condensates (BECs) can induce spin textures, even though it is weaker than other interactions. The key feature of the dipolar interaction is that it is spin-orbit coupling interaction which conserves total angular momentum. Therefore, at extremely low magnetic field, an initially spin-polarized BEC starts rotating spontaneously. Moreover, spin textures develop in the ground state, leading to spontaneous mass current. Such dipolar effect should be observed in a spinor BEC of ^<87>Rb atoms.

  52. Ferrofluidity in a Two-Component Dipolar Bose-Einstein Condensate Reviewed

    Saito Hiroki, Kawaguchi Yuki, Ueda Masahito

    PHYSICAL REVIEW LETTERS   Vol. 102 ( 23 )   2009.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.102.230403

    Web of Science

  53. Coherent collapses of dipolar Bose-Einstein condensates for different trap geometries Reviewed International coauthorship

    Metz J., Lahaye T., Froehlich B., Griesmaier A., Pfau T., Saito H., Kawaguchi Y., Ueda M.

    NEW JOURNAL OF PHYSICS   Vol. 11   2009.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/1367-2630/11/5/055032

    Web of Science

  54. KIBBLE-ZUREK MECHANISM IN MAGNETIZATION OF A SPINOR BOSE-EINSTEIN CONDENSATE Reviewed

    Saito Hiroki, Kawaguchi Yuki, Ueda Masahito

    PROCEEDINGS OF THE 9TH INTERNATIONAL SYMPOSIUM ON FOUNDATIONS OF QUANTUM MECHANICS IN THE LIGHT OF NEW TECHNOLOGY     page： 33 - 36   2009

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    Web of Science

  55. d-wave collapse and explosion of a dipolar Bose-Einstein condensate Reviewed International coauthorship

    Lahaye T., Metz J., Froehlich B., Koch T., Meister M., Griesmaier A., Pfau T., Saito H., Kawaguchi Y., Ueda M.

    PHYSICAL REVIEW LETTERS   Vol. 101 ( 8 )   2008.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.101.080401

    Web of Science

  56. Knots in a spinor Bose-Einstein condensate (vol 100, art no 180403, 2008) Reviewed

    Kawaguchi Yuki, Nitta Muneto, Ueda Masahito

    PHYSICAL REVIEW LETTERS   Vol. 101 ( 2 )   2008.7

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.101.029902

    Web of Science

  57. Knots in a spinor Bose-Einstein condensate Reviewed

    Kawaguchi Yuki, Nitta Muneto, Ueda Masahito

    PHYSICAL REVIEW LETTERS   Vol. 100 ( 18 )   2008.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.100.180403

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  58. Heteronuclear fermionic superfuids with spin degrees of freedom Reviewed International coauthorship

    Dickerscheid D. B. M., Kawaguchi Y., Ueda M.

    PHYSICAL REVIEW A   Vol. 77 ( 5 )   2008.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.77.053605

    Web of Science

  59. Kibble-Zurek mechanism in a quenched ferromagnetic Bose-Einstein condensate Reviewed

    Saito Hiroki, Kawaguchi Yuki, Ueda Masahito

    PHYSICAL REVIEW A   Vol. 76 ( 4 )   2007.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.76.043613

    Web of Science

  60. Symmetry breaking in scalar, spinor, and rotating Bose-Einstein condensates Reviewed

    Saito Hiroki, Kawaguchi Yuki, Ueda Masahito

    NUCLEAR PHYSICS A   Vol. 790   page： 737C - 471C   2007.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.nuclphysa.2007.03.122

    Web of Science

  61. Can spinor dipolar effects be observed in Bose-Einstein condensates? Reviewed

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    PHYSICAL REVIEW LETTERS   Vol. 98 ( 11 )   2007.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.98.110406

    Web of Science

  62. Topological defect formation in a quenched ferromagnetic Bose-Einstein condensates Reviewed

    Saito Hiroki, Kawaguchi Yuki, Ueda Masahito

    PHYSICAL REVIEW A   Vol. 75 ( 1 )   2007.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.75.013621

    Web of Science

  63. Spontaneous circulation in ground-state spinor dipolar Bose-Einstein condensates Reviewed

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    PHYSICAL REVIEW LETTERS   Vol. 97 ( 13 )   2006.9

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.97.130404

    Web of Science

  64. Einstein-de Haas effect in dipolar Bose-Einstein condensates Reviewed

    Kawaguchi Y, Saito H, Ueda M

    PHYSICAL REVIEW LETTERS   Vol. 96 ( 8 )   2006.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.96.080405

    Web of Science

  65. Breaking of chiral symmetry and spontaneous rotation in a spinor Bose-Einstein condensate Reviewed

    Saito H, Kawaguchi Y, Ueda M

    PHYSICAL REVIEW LETTERS   Vol. 96 ( 6 )   2006.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.96.065302

    Web of Science

  66. Symmetry breaking in Bose-Einstein condensates Reviewed

    Ueda Masahito, Kawaguchi Yuki, Saito Hiroki, Kanamoto Rina, Nakajima Tatsuya

    Atomic Physics 20   Vol. 869   page： 165 - 172   2006

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    Language：English   Publishing type：Research paper (scientific journal)  

    Web of Science

  67. 原子気体BECにおける量子渦の分裂 Invited Reviewed

    川口 由紀

    物性研究   Vol. 83 ( 6 ) page： 787 - 816   2005.3

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    Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    この論文は国立情報学研究所の電子図書館事業により電子化されました。

  68. Topological phase imprinting in BEC in presence of gravitational field Reviewed

    Kawaguchi Y, Nakahara M, Ohmi T

    JOURNAL OF LOW TEMPERATURE PHYSICS   Vol. 138 ( 3-4 ) page： 699 - 704   2005.2

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1007/s10909-005-2289-9

    Web of Science

  69. Topological vortex formation in a Bose-Einstein condensate under gravitational field Reviewed

    Kawaguchi Y, Nakahara M, Ohmi T

    PHYSICAL REVIEW A   Vol. 70 ( 4 )   2004.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.70.043605

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  70. Splitting instability of a multiply charged vortex in a Bose-Einstein condensate Reviewed

    Kawaguchi Y, Ohmi T

    PHYSICAL REVIEW A   Vol. 70 ( 4 )   2004.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevA.70.043610

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  71. Stability of quadruply charged vortices in Bose-Einstein condensates Reviewed

    Kawaguchi Y, Ohmi T

    LASER PHYSICS   Vol. 14 ( 4 ) page： 575 - 580   2004.4

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    Web of Science

  72. Collective oscillations of vortex lattices in rotating Bose-Einstein condensates Reviewed International coauthorship

    Mizushima T, Kawaguchi Y, Machida K, Ohmi T, Isoshima T, Salomaa MM

    PHYSICAL REVIEW LETTERS   Vol. 92 ( 6 )   2004.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.92.060407

    Web of Science

  73. Stability of magnetically trapped Bose-Einstein condensates Reviewed

    Kawaguchi Y, Ohmi T

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 72 ( 5 ) page： 1118-1122   2003.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/JPSJ.72.1118

    Web of Science

▼display all

To the head of Papers.▲

Books 2

  1. Understanding Qunatum Phase Transitions / Topological Excitations in Superfluids with Interhal Degrees of Freedom

    Yuki Kawaguchi, Masahito Ueda（ Role： Contributor）

    Taylor and Francis  2011 

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    Language：English Book type：Scholarly book

  2. Electromagnetic, Magnetostatic, and Exchange-Interaction Vortices in Confined Magnetic Structures / Topological defect formation in spinor and dipolar Bose-Einstein

    Hiroki Saito, Yuki Kawaguchi, Masahito Ueda（ Role： Contributor）

    Research Signpost Publisher  2008 

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    Language：English Book type：Scholarly book

To the head of Books.▲

Presentations 118

  1. 歪んだスキルミオン結晶における異方的ホール角

    亀田麻衣, 廣部大地, 川口由紀

    応用物理学会春季学術講演会  2024.3.23 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京都市大学   Country：Japan  

  2. 歪んだスキルミオン三角格子が誘起する異方的ホール角

    亀田麻衣, 廣部大地, 川口由紀

    日本物理学会 2024年春季大会  2024.3.18 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  3. スピン1マイクロBECにおける散逸誘起磁性相

    米屋斗馬, 藤本和也, 川口由紀

    日本物理学会 第78回年次大会  2023.9.19 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東北大学   Country：Japan  

  4. スピノールボース・アインシュタイン凝縮体における異モード結合によるパラメトリック共鳴

    中村陸人, 川口由紀

    日本物理学会 第78回年次大会  2023.9.16 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東北大学   Country：Japan  

  5. Mechanisms and Control of Inter-Skyrmion Attractions International conference

    Mai Kameda, Koji Kobayashi, and Yuki Kawaguchi

    Intermag 2023 

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    Event date： 2023.5

    Language：English   Presentation type：Poster presentation  

    Venue：Sendai International Center, Sendai, Japan   Country：Japan  

  6. Attractively interacting skyrmions under magneto-crystalline anisotropy in 2D chiral magnets International conference

    Mai Kameda, Yuki Kawaguchi

    APS March Meeting 2023  2023.3.22 

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    Event date： 2023.3

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Online   Country：United States  

  7. Superfluids under external driving Invited International conference

    Yuki Kawaguchi

    Mathematical Structures in Quantum Fluids  2023.1.23 

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    Event date： 2023.1

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Osaka City University   Country：Japan  

  8. Quantized vortices in a Bose-Einstein condensate with internal degrees of freedom space Invited International conference

    Yuki Kawaguchi

    Space-time topology and geometry with a focus on vorticity and magnetic fields  2022.12.15 

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    Event date： 2022.12

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Hakata   Country：Japan  

  9. 量子kicked rotorを用いたフロケ・トポロジカル相の提案

    小山湧介, 藤本和也, 中島秀太, 川口由紀

    日本物理学会  2022.9.13 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京工業大学   Country：Japan  

  10. 磁場下でのSQUID素子中のマヨラナ状態の振る舞い

    中河西翔, 柏谷聡, 川口由紀

    日本物理学会  2022.9.12 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京工業大学   Country：Japan  

  11. スピン1マイクロBECでの量子相転移点近傍における多体効果

    米屋斗馬, 藤本和也, 川口由紀

    日本物理学会  2022.9.14 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京工業大学   Country：Japan  

  12. 振動外場を用いた量子多体系のカレント制御

    水野充人, 藤本和也, 川口由紀

    日本物理学会  2022.9.13 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京工業大学   Country：Japan  

  13. Superfluids under External Driving Invited International conference

    Yuki Kawaguchi

    29th International Conference on Low Temperature Physics  2022.8.19 

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    Event date： 2022.8

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Sapporo   Country：Japan  

  14. Proposal for Realizing Floquet Topological Phases in Class CII Using a Kicked Rotor Model International conference

    Yusuke Koyama, Kazuya Fujimoto, Shuta Nakajima, and Yuki Kawaguchi

    29th International Conference on Low Temperature Physics  2022.8.20 

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    Event date： 2022.8

    Language：English   Presentation type：Poster presentation  

    Venue：Sapporo   Country：Japan  

  15. Spin-wave growth via Shapiro resonances in a spinor Bose-Einstein condensate Invited International conference

    Yuki Kawaguchi

    Ultracold Atoms Japan 2022  2022.4.13 

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    Event date： 2022.4

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：OIST, Okinawa   Country：Japan  

  16. Attractive inter-skyrmion couplings induced by distorted skyrmions International conference

    EP2DS-24/MSS-20  2021.11.5 

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    Event date： 2021.10 - 2021.11

    Language：English   Presentation type：Poster presentation  

  17. Attractive inter-skyrmion couplings induced by distorted skyrmions Invited International conference

    The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics  2021.10.25 

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    Event date： 2021.10

    Language：English   Presentation type：Oral presentation (invited, special)  

  18. Attractive inter-skyrmion couplings induced by distorted skyrmions International conference

    The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics  2021.10.26 

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    Event date： 2021.10

    Language：English   Presentation type：Poster presentation  

  19. スピノール・ボース・アインシュタイン凝縮体のドメイン壁におけるシャピロ共鳴

    今枝祐哉、藤本和也、川口由紀

    日本物理学会2021年秋季大会  2021.9.21 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  20. 異方的2次元カイラル磁性体における歪んだ磁気スキルミオン間の引力相互作用

    亀田麻衣、川口由紀

    日本物理学会2021年秋季大会  2021.9.21 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  21. Inhomogeneous Shapiro resonance in a spinor Bose-Einstein condensate International conference

    Yuya Imaeda, Kazuya Fujimoto, and Yuki Kawaguchi.

    Laser Physics 21  2021.7.22 

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    Event date： 2021.7

    Language：English   Presentation type：Oral presentation (general)  

  22. 内部自由度を持った原子気体ボース・アインシュタイン凝縮体の理論研究 Invited

    川口由紀

    日本物理学会第76回年次大会　米沢賞受賞講演  2021.3.12 

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    Event date： 2021.3

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

  23. 乱れたポテンシャル中のフェルミ粒子系における非平衡界面揺らぎの成長則

    藤本和也、濱崎立資、川口由紀

    日本物理学会第76回年次大会  2021.3.12 

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    Event date： 2021.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  24. スピノールボース・アインシュタイン凝縮体における非一様シャピロ共鳴

    今枝祐哉, 藤本和也, 川口由紀

    第２回冷却原子研究会　アトムの会  2020.9.28 

    　More details

    Event date： 2020.9

    Language：Japanese   Presentation type：Poster presentation  

  25. スピノールボース・アインシュタイン凝縮体における非一様シャピロ共鳴

    今枝祐哉, 藤本和也, 川口由紀

    日本物理学会2020年秋季大会  2020.9.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  26. 擬スピン3/2超伝導の表面状態密度：ボゴリューボフフェルミ面の効果

    金澤彰太郎, 小林伸吾, 田仲由喜夫, 川口由紀

    日本物理学会2020年秋季大会  2020.9.10 

    　More details

    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  27. Bose-Einstein Condensates with Spin-orbit Interactions Invited

    Yuki Kawaguchi

    REIMEI Workshop on "Universal Features of Quantum Flows with Spin, Orbital and Tensor Correlations" 

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    Event date： 2020.2

    Language：English   Presentation type：Oral presentation (invited, special)  

    Country：Japan  

  28. 秩序は混沌からどのように生まれるか？ Invited

    川口由紀

    第６回 名古屋大学の卓越・先端・次世代研究シンポジウム『専門性と学際性の狭間で』 

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    Event date： 2020.1

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：名古屋大学   Country：Japan  

  29. Vortex nucleation dynamics in a spin-orbital angular momentum coupled BEC

    Y. Kawaguchi and Y.-J. Lin

    International Conference on Topological Materials Science 2019 

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    Event date： 2019.12

    Language：English   Presentation type：Poster presentation  

    Venue：Kyoto University   Country：Japan  

  30. Generalized Berry phase for a bosonic Bogoliubov system with exceptional points Invited

    Yuki Kawaguchi

    Mathematical approach for topological physics (II) 

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    Event date： 2019.9

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Nagoya University   Country：Japan  

  31. トポロジカル絶縁体上のギャップレス超伝導状態の理論

    中河西翔, 田仲由喜夫, 川口由紀

    日本物理学会第74回年次大会 

    　More details

    Event date： 2019.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  32. ボース・アインシュタイン凝縮体における トポロジカル励起バンド Invited

    川口　由紀

    日本物理学会第74回年次大会 シンポジウム講演 

    　More details

    Event date： 2019.3

    Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

    Country：Japan  

  33. Topological phases in 1D bosonic Bogoliubov bands with dynamical instability International conference

    大橋輝道, 小林伸吾, 川口由紀

    American Physical Society (APS) March Meeting 2019 

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    Event date： 2019.3

    Language：English   Presentation type：Oral presentation (general)  

    Country：United States  

  34. 横磁場下のカイラル磁性体薄膜における1次元スキルミオン列

    中島拓朗, 小山莉央, 川口由紀

    第4回「トポロジーが紡ぐ物質科学のフロンティア」領域研究会 

    　More details

    Event date： 2019.1

    Language：Japanese   Presentation type：Poster presentation  

    Country：Japan  

  35. Symmetry constraints on a winding number in topological phase of Bose-Einstein condensate

    大橋輝道, 小林伸吾, 川口由紀

    第4回「トポロジーが紡ぐ物質科学のフロンティア」領域研究会 

    　More details

    Event date： 2019.1

    Language：Japanese   Presentation type：Poster presentation  

    Country：Japan  

  36. Topological excitation bands from a 1D Bose-Einstein condensate Invited

    川口由紀

    量子渦と非線形波動 

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    Event date： 2018.12

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：東京理科大学   Country：Japan  

  37. １次元ボース・アインシュタイン凝縮体におけるトポロジカル相

    大橋輝道, 小林伸吾, 川口由紀

    第10回トポロジー連携研究会「非平衡系・非エルミート系の新奇量子現象」 

    　More details

    Event date： 2018.11

    Language：Japanese   Presentation type：Poster presentation  

    Country：Japan  

  38. 原子気体BECにおけるトポロジー Invited

    川口由紀

    久保記念シンポジウム 

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    Event date： 2018.10

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：学士会館   Country：Japan  

  39. 2次元トポロジカル超伝導体における外部磁場で制御されるマヨラナフェルミオンの理論

    鈴木修, 川口由紀, 田仲由喜夫

    日本物理学会　2018年秋季大会 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：同志社大学   Country：Japan  

  40. 2次元ボース・アインスタイン凝縮体のトポロジカル相

    大橋輝道, 小林伸吾, 川口由紀

    日本物理学会　2018年秋季大会 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：同志社大学   Country：Japan  

  41. 横磁場によるスキルミオン格子の変形

    中島拓朗, 小山莉央, 川口由紀

    日本物理学会　2018年秋季大会 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：同志社大学   Country：Japan  

  42. One-dimensional Topological Phase in Bose-Einstein Condensates

    T. Ohashi, S. Kobayashi, Y. Kawaguchi

    　More details

    Event date： 2018.7 - 2018.8

    Language：Japanese   Presentation type：Poster presentation  

    Country：Japan  

  43. 磁化したトポロジカル絶縁体表面におけるジョセフソン接合

    土岐翼, Bo Lu, Pablo Burset, 川口由紀, 田仲由喜夫

    日本物理学会　第73回年次大会 

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    Event date： 2018.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京理科大学   Country：Japan  

  44. ボース・アインシュタイン凝縮体のトポロジカル相におけるバルク・エッジ対応

    大橋輝道, 小林伸吾, 川口由紀

    日本物理学会　第73回年次大会 

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    Event date： 2018.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京理科大学   Country：Japan  

  45. ボース凝縮体における励起スペクトルの トポロジカルな分類 Invited

    川口由紀

    量子渦と非線形波動 

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    Event date： 2018.1

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：東京理科大学   Country：Japan  

  46. Interaction between Magnetic Skyrmions Invited International conference

    Y. Kawaguchi, R. Koyama

    TMS-EPiQS 2nd Alliance Workshop 

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    Event date： 2018.1

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Kyoto, Japan   Country：Japan  

  47. Bulk-edge correspondence for Bogoliubov band in Bose Einstein condensate International conference

    T. Ohashi, S. Kobayashi, Y. Kawaguchi

    International Symposium on Fluctuation and Structere out of Equilibrium 2017 

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    Event date： 2017.11

    Language：English   Presentation type：Poster presentation  

    Venue：Sendai, Japan   Country：Japan  

  48. Bulk-edge correspondence for Bose Einstein condensate International conference

    T. Ohashi, S. Kobayashi, Y. Kawaguchi

    Okinawa School in Physics 2017: Coherente Quantum Dynamics 

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    Event date： 2017.9 - 2017.10

    Language：English   Presentation type：Poster presentation  

    Venue：Okinawa, Japan   Country：Japan  

  49. アクシオンドメインによる電磁場応答

    今枝立至, 川口由紀

    日本物理学会　2017年秋季大会 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：岩手大学   Country：Japan  

  50. Domain Growth Dynamics in a Population Imbalanced Binary BEC International conference

    K. Haneda, K. Kudo, Y. Kawaguchi

    28th International Conference on Low Temperature Physics (LT28) 

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    Event date： 2017.8

    Language：English   Presentation type：Poster presentation  

    Venue：Gotherburg, Sweden   Country：Sweden  

  51. Coarsening dynamics in spinor Bose-Einstein condensates Invited International conference

    Y. Kawaguchi, K. Haneda, K. Kudo

    International workshop on Topological structures in Quantum Matter 

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    Event date： 2017.6

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Hanaholmen, Finland   Country：Finland  

  52. Coarsening dynamics of a binary Bose-Einstein condensate International conference

    Y. Kawaguchi, K. Haneda, K. Kudo

    International Conference on Topological Materials Science 2017 (TopoMat2017) 

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    Event date： 2017.5

    Language：English   Presentation type：Poster presentation  

    Venue：Tokyo, Japan   Country：Japan  

  53. 粒子数差のある2成分BECにおけるドメイン成長

    羽根田和紀、工藤和恵、川口由紀

    日本物理学会　第72回年次大会 

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    Event date： 2017.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  54. 磁気スキルミオン間に働く相互作用ポテンシャル

    小山莉央、川口由紀

    日本物理学会　第72回年次大会 

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    Event date： 2017.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  55. バイナリBECにおけるドメイン成長のダイナミクス

    川口由紀、羽根田和紀、工藤和恵

    新学術領域「ゆらぎと構造の協奏」第 2 回冷却原⼦研究会 

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    Event date： 2017.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：⼤阪市⽴⼤学杉本キャンパス（大阪府大阪市）   Country：Japan  

  56. Skyrmionic spin textures at chiral-magnet/ferromagnet heterostructures

    　More details

    Event date： 2016.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  57. Dynamic property of spinor and dipolar Bose-Einstein condensates Invited International conference

    Yuki Kawaguchi

    Quantum Simulations and Numerical studies in Many-Body Physics 

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    Event date： 2016.12

    Language：English   Presentation type：Oral presentation (general)  

    Venue：National Tsing Hua University, Hsinchu, Taiwan   Country：Taiwan, Province of China  

  58. スピノール・ダイポールBECにおける スピンホール効果 Invited

    川口由紀

    第3回　量子渦と非線形波動 

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    Event date： 2016.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  59. Coherent Quantum Dynamics in Bose-Einstein Condensates with Spin Degrees of Freedom Invited

    Yuki Kawaguchi

    Okinawa School in Physics: Coherent Quantum Dynamics 

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    Event date： 2016.9 - 2016.10

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  60. スピン自由度を持ったボース・アインシュタイン凝縮体における量子渦

    川口由紀、工藤和恵

    日本流体力学会　年会2016 

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    Event date： 2016.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋工業大学　御器所キャンパス（愛知県名古屋市）   Country：Japan  

  61. Spin Hall Effect in a Spinor-Dipolar Bose-Einstein Condensate International conference

    Yuki Kawaguchi, Toshiyuki Oshima

    TOPO MAT Meeting 

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    Event date： 2016.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Max-Planck Institute Stuttgart, Germany   Country：Germany  

  62. Spin Hall Effect in a Spinor-Dipolar Bose-Einstein Condensate Invited

    Yuki Kawagchi, Toshiyuki Oshima

    CEMS Topical Meeting on Cold Atoms 

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    Event date： 2016.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：RIKEN (Wako, Saitama, Japan)   Country：Japan  

  63. トポロジカルバンドの自発形成と相転移ダイナミクス

    川口由紀

    新学術領域「トポロジーが紡ぐ物質科学のフロンティア」公募班キックオフミーティング 

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    Event date： 2016.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都大学   Country：Japan  

  64. 内部自由度を持ったBECにおける磁化ダイナミクス

    川口 由紀

    日本物理学会　第71回年次大会 

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    Event date： 2016.3

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：東北学院大学　泉キャンパス   Country：Japan  

  65. スピノール・ダイポールBECにおけるスピンホール効果

    川口 由紀

    物性研短期研究会「量子乱流と古典乱流の邂逅」  

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    Event date： 2016.1

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京大学物性研究所   Country：Japan  

  66. スピノール・ダイポールBECにおけるスピンホール効果

    川口 由紀、大嶋俊之

    学術領域「トポロジーが紡ぐ物質科学のフロンティア」　第一回領域研究会  

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    Event date： 2015.12

    Language：English   Presentation type：Oral presentation (general)  

    Venue：京都大学   Country：Japan  

  67. 16aBA-7 Inverse Spin Hall effect in spinor-dipolar Bose-Einstein Condensate

    Oshima T., Kawaguchi Y.

    The Physical Society of Japan (JPS) 

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    Event date： 2015.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  68. 19aAG-4 Axion electromagnetic effect of topological insulators near topological phase transition

    Imaeda Tatsushi, Kawaguchi Yuki, Tanaka Yukio, Sato Masatoshi

    The Physical Society of Japan (JPS) 

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    Event date： 2015.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  69. 18aCM-5 Skyrmionic spin textures at chiral-magnet/ferromagnet heterostructures

    Kawaguchi Y., Tanaka Y., Nagaosa N.

    The Physical Society of Japan (JPS) 

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    Event date： 2015.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  70. 17aBA-3 Controlling and Probing Non-Abelian Emergent Gauge Potentials in Spinor Bose-Fermi Mixtures

    フク グェンタン, 多々良 源, 川口 由紀, 上田 正仁

    一般社団法人日本物理学会 

    　More details

    Event date： 2015.9

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  71. 内部自由度を持ったBECにおける量子渦

    川口 由紀

    数理解析所共同研究「非線形現象のモデルに潜む未踏査数理構造の探求 - 基礎数理と応用の協働 - 」 

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    Event date： 2015.7

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：京都大学数理解析研究所   Country：Japan  

  72. Skyrmionic spin textures at chiral magnet/ferromagnet heterostructures International conference

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    Event date： 2015.5

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  73. 21aAR-4 Magnetic domain pattern formation in a two-dimensional Bose-Einstein condensate

    Kudo Kazue, Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

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    Event date： 2015.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  74. 内部自由度を持ったBECにおける量子渦

    川口 由紀

    研究会「量子渦と非線形波動」  

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    Event date： 2015.1

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：東京理科大学神楽坂キャンパス   Country：Japan  

  75. Off-diagonal current-current correlation in a spinor dipolar Bose-Einstein Condensate International conference

    T. Oshima and Y. Kawaguchi

    International conference on topological quantum phenomena (TQP2014) 

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    Event date： 2014.12

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  76. Goldstone-mode Instability in a Spinor Bose-Einstein Condensates International conference

    Y. Kawaguchi

    International conference on topological quantum phenomena (TQP2014) 

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    Event date： 2014.12

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  77. 8pAW-5 Goldstone-mode instability in a spinor Bose-Einstein condensate

    Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

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    Event date： 2014.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  78. 10pAQ-9 Magnetic domain growth in a two-dimensional Bose-Einstein condensate

    Kudo Kazue, Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

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    Event date： 2014.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  79. Goldstone-mode instability in a spinor Bose-Einstein condensate International conference

    Y. Kawaguchi

    The ISSP International Workshop 

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    Event date： 2014.6 - 2014.7

    Language：English   Presentation type：Oral presentation (invited, special)  

    Country：Japan  

  80. 26aBA-5 スピノルBECにおける励起モードと準粒子(量子エレクトロニクス(Bose粒子系の理論),領域1(原子・分子,量子エレクトロニクス,放射線物理))

    グェン タン フク, 川口 由紀, 上田 正仁

    一般社団法人日本物理学会 

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    Event date： 2013.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  81. 28pEE-2 First-Order Quantum Phase Transition in Bose Gases

    フク グェン タン, 川口 由紀, 上田 正仁

    一般社団法人日本物理学会 

    　More details

    Event date： 2013.3

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  82. 29aXZD-1 Growth of domain patterns in a ferromagnetic BEC

    Kudo Kazue, Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2013.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  83. Symmetry Classification of Spinor Bose-Einstein Condensates International conference

    Y. Kawaguchi

    QS2C Theory Forum: International Symposium on Strongly Correlated Quantum Science, 

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    Event date： 2013.1

    Language：English   Presentation type：Oral presentation (invited, special)  

    Country：Japan  

  84. 19aAL-1 Geometrical determination of internal degrees of freedom at vortex cores and its application to spinor Bose condensates International conference

    Kobayashi M., Kobayashi S., Nitta M., Kawaguchi Y., Ueda M.

    The Physical Society of Japan (JPS) 

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    Event date： 2012.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  85. 19aAL-10 Spin-Texture-Induced Effective Gauge Field International conference

    Kawaguchi Yuki, Ueda Masahito

    The Physical Society of Japan (JPS) 

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    Event date： 2012.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  86. 19aAL-5 内部自由度をもったボース凝縮体でのBeliaev理論(19aAL 量子エレクトロニクス(Bose粒子系の理論),領域1(原子・分子,量子エレクトロニクス,放射線物理)) International conference

    Phuc Nguyen Thanh, 川口 由紀, 上田 正仁

    一般社団法人日本物理学会 

    　More details

    Event date： 2012.8

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  87. 25pBE-12 Effects of quantum depletion on the ground-state phase diagram of a ^<87>Rb Bose-Einstein condensate International conference

    Phuc Nguyen Thanh, 川口 由紀, 上田 正仁

    一般社団法人日本物理学会 

    　More details

    Event date： 2012.3

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  88. 25pBE-13 Classification of vortex core structures in spinor BECs International conference

    Kobayashi S., Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    The Physical Society of Japan (JPS) 

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    Event date： 2012.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  89. 21pEE-10 Symmetry restoring dynamics in a micro spinor Bose-Einstein condensates International conference

    Kawaguchi Yuki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2011.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  90. 22pPSA-71 Topological stability of the vortex core state in spinor BECs International conference

    Kobayashi S., Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2011.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  91. 22pGT-2 Domain pattern formation in a spinor BEC and the effect of superfluid flow International conference

    Kudo Kazue, Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2011.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  92. 25pRD-4 Selection rule of topological excitations for phase transitions in spinor BECs International conference

    Kobayashi S., Kawaguchi Y., Kobayashi M., Ueda M.

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2011.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  93. 25aRD-8 Hydrodynamic equation of a spinor dipolar BEC International conference

    Kudo Kazue, Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

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    Event date： 2010.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  94. 25pXB-12 Non-Abelian quantum turbulence International conference

    Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    The Physical Society of Japan (JPS) 

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    Event date： 2010.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  95. Non-Abelian Vortices and Their Collision Dynamics in Spinor Bose-Einstein Condensates(Current Topics) International conference

    Kobayashi Michikazu, Kawaguchi Yuki, Nitta Muneto, Ueda Masahito

    The Physical Society of Japan (JPS) 

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    Event date： 2010.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

    Bose-Einstein condensates (BECs) with spin degrees of freedom are predicted to realize non-Abelian vortices. Non-Abelian vortices are now studied in various research arenas such as cosmology, high-energy physics, solid-state physics, and soft matter physics. We report the unique collision dynamics of non-Abelian vortices realized in the cyclic phase of a spin-2 spinor BEC.

  96. 20pTB-1 Vortex tiling in spin-2 spinor Bose-Einstein condensates International conference

    Kobayashi M., Kawaguchi Y., Ueda M.

    The Physical Society of Japan (JPS) 

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    Event date： 2010.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  97. 20pTB-4 Generalization of topological charges for excitations in spinor BECs International conference

    Kobayashi S., Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2010.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  98. 20pTB-2 Symmetry classification of the ground states of spin-3 spinor Bose-Einstein condensates International conference

    Kawaguchi Yuki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2010.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  99. 25aZE-5 Classification of a relation between topolosical exitetions by Homotopy theory International conference

    Kobayashi S., Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2009.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  100. Spinor Dipolar Bose-Einstein Condensates(Current Topics) International conference

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2009.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

    Magnetic dipole-dipole interaction in atomic Bose-Einstein condensates (BECs) can induce spin textures, even though it is weaker than other interactions. The key feature of the dipolar interaction is that it is spin-orbit coupling interaction which conserves total angular momentum. Therefore, at extremely low magnetic field, an initially spin-polarized BEC starts rotating spontaneously. Moreover, spin textures develop in the ground state, leading to spontaneous mass current. Such dipolar effect should be observed in a spinor BEC of ^<87>Rb atoms.

  101. 28pSK-2 Non-Abelian vortex International conference

    Kobayashi M., Kawaguchi Y., Nitta M., Ueda M.

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2009.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  102. 28pSK-10 Quantum Cluster Expansion Approach at Unitality Limit International conference

    Inokuchi Kohji, Kawaguchi Yuki, Ueda Masahito

    The Physical Society of Japan (JPS) 

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    Event date： 2009.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  103. 28pSK-3 Magnetic Pattern Formation in Spinor Dipolar BECs International conference

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2009.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  104. 21pQA-2 Topological excitations in spinor Bose-Einstein condensates International conference

    Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2008.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  105. 22aZD-12 Quantum Cluster Expansion Approach for BEC-BCS Crossover International conference

    Inokuchi Kohji, Kawaguchi Yuki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2008.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  106. 24pRF-3 Kibble-Zurek mechanism in a spinor BEC International conference

    SAITO Hiroki, KAWAGUCHI Yuki, UEDA Masahito

    The Physical Society of Japan (JPS) 

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    Event date： 2008.2

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  107. 24aQD-11 Theory of Spinor Dipolar Bose-Einstein Condensates International conference

    Kawaguchi Yuki

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2008.2

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  108. 24pRF-2 Knot in a Spinor Bose-Einstein Condensate International conference

    Kawaguchi Yuki, Nitta Muneto, Ueda Masahito

    The Physical Society of Japan (JPS) 

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    Event date： 2008.2

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  109. 21pRG-8 Spontaneous magnetization process in a spinor BEC International conference

    SAITO Hiroki, KAWAGUCHI Yuki, UEDA Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2007.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  110. 21pRG-6 Magnetic dipole-dipole interactions in spinor BECs under external magnetic field International conference

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2007.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  111. 18aXJ-7 Spontaneous Circulation in Ground-State Dipolar BECs International conference

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2007.2

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  112. 23pRB-12 Spontaneous vortex creation in a spinor BEC International conference

    SAITO Hiroki, KAWAGUCHI Yuki, UEDA Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2006.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  113. 23pRB-13 Einstein-de Haas Effect in Dipolar Bose-Einstein Condensates International conference

    Kawaguchi Yuki, Saito Hiroki, Ueda Masahito

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2006.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  114. 12pTF-4 Vortex state in Superfluid Trapped Fermi Gases near a Feshbach Resonance

    Kawaguchi Yuki, Ohmi Tetsuo

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2004.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  115. 27pXG-3 Collective Oscillations of Vortex Lattices in Rotating Base-Einstein Condensates II

    Mizushima T., Kawaguchi Y., Machida K., Ohmi T., Isoshima T., M. Salomaa Martti

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2004.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  116. 27pXG-4 Effect of Gravity upon Vortex Imprinting Processes in Spinor Bose-Einstien Condensates

    Kawaguchi Y., Nakahara M., Ohmi T.

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2004.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  117. Decay process of quadruply charged vortices in Bose-Einstein condensates

    Kawaguchi Yuki, Ohmi Tetsuo

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2003.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  118. Stability of magnetically trapped BEC

    Kawaguchi Yuki, Ohmi Tetsuo

    The Physical Society of Japan (JPS) 

    　More details

    Event date： 2002.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

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To the head of Presentations.▲

Works 2

  1. 新著紹介「量子流体力学 / 坪田誠、笠松健一、小林未知数、竹内宏光 著」

    2019.3

  2. 書評「数物系に向けたフーリエ解析とヒルベルト空間論　量子科学への誘い / 廣川真男 著」

    2018.5

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Research Project for Joint Research, Competitive Funding, etc. 4

  1. 冷却原子気体における連結ジョセフソン振動子の同期現象

    2021.4 - 2022.3

    豊田理研スカラー 

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    Authorship：Principal investigator 

    Grant amount：\1000000 （ Direct Cost: \1000000 ）

  2. トポロジカル量子計算の基盤技術構築

    2016.10 - 2022.3

    特色ある大学教育支援プログラム 

    笹川 崇男

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    Grant type：Competitive

    トポロジカルな二次元の特殊超伝導状態に出現するマヨラナ粒子を、近未来のデバイス技術へ繋ぐ基盤を構築します。量子計算にマヨラナ粒子を利用すると、寸法・消費電力・計算精度・回路拡張性・量子機能（演算＋メモリー）の全てにおいて既存技術を凌駕できます。このような「トポロジカル量子計算」の実現に向けて、要素技術（マヨラナ粒子の検出・操作）の確立と革新的素材（トポロジカル超伝導体）の創製に挑戦します。

  3. 井上リサーチアウォード研究助成　スピノールBECにおける量子多体効果の研究

    2012.4 - 2015.3

    学内共同研究 

  4. スピン自由度を持った冷却原子気体の有限温度理論

    2010.4 - 2012.3

    二国間交流事業(ニュージーランドとの共同研究) 

    　 More details

    Grant type：Competitive

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KAKENHI (Grants-in-Aid for Scientific Research) 6

  1. Non-Hermitian quantum spin-photon coupled system

    Grant number：21H01009  2021.4 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    　 More details

    Authorship：Coinvestigator(s) 

  2. Topological quantum phenomena in atomic Bose-Einstein condensates

    Grant number：19H01824  2019.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    　 More details

    Authorship：Principal investigator 

    Grant amount：\15210000 （ Direct Cost: \11700000 、 Indirect Cost：\3510000 ）

  3. Non-trivial quantum states in superconducting topological magnets

    Grant number：18K03538  2018.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    　 More details

    Authorship：Coinvestigator(s) 

  4. Spontaneous formation of the topological band structure and phase transition dynamics

    Grant number：16H00989  2016.4 - 2018.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Authorship：Principal investigator 

    Grant amount：\2990000 （ Direct Cost: \2300000 、 Indirect Cost：\690000 ）

  5. Topological structures and transport phenomena in a spin-orbit coupled system

    Grant number：15K17726  2015.4 - 2020.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Kawaguchi Yuki

    　 More details

    Authorship：Principal investigator 

    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

    We studied topological quantum phenomena caused by spin-orbit coupling. For Bose-Einstein condensates (BECs) of cold atmoic gases, we have discussed the spin Hall effect, BEC dynamics under a non-Abelian gauge field, and topological invariants defined in a non-Hermitian system, which arise from the magnetic dipole-dipole interaction or Laser-induced spin-orbital coupling. For solid-state systems, we have investigated transport phenomena and magnetic skyrmion structure caused by spin-orbit interaction originating from relativistic effects.

  6. 双極子相互作用が拓く冷却原子気体の新現象

    2010.4 - 2015.3

    科学研究費補助金  若手研究(B)

    　 More details

    Authorship：Principal investigator 

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To the head of KAKENHI (Grants-in-Aid for Scientific Research).▲
 

Teaching Experience (On-campus) 36

  1. 物理工学のすすめ

    2022

  2. 物理工学セミナー

    2022

  3. Graduation Thesis A

    2022

  4. Graduation Thesis B

    2022

  5. Technical Visits in Industrial Plants

    2021

  6. Advanced Materials and Solid State Physics

    2020

  7. Engineering Mathematics I with Exercises

    2020

  8. Mathematics I and Tutorial

    2020

  9. Seminar on Solid State Engineering 1B

    2020

  10. Seminar on Solid State Engineering 1A

    2020

  11. Reading and Discussion on Applied Physics（Solid State Engineering） B

    2020

  12. Reading and Discussion on Applied Physics（Solid State Engineering） A

    2020

  13. Seminar on Solid State Engineering 1C

    2020

  14. Experimental Research and Exercises on Solid State Engineering B

    2020

  15. Experimental Research and Exercises on Solid State Engineering A

    2020

  16. Advanced Lectures on Solid State Engineering

    2020

  17. Seminar on Solid State Engineering 1D

    2020

  18. 物理工学序論

    2020

  19. Physical Engineering Journal Club A

    2020

  20. Physical Engineering Seminar 1A

    2020

  21. Seminar on Solid State Engineering 2E

    2020

  22. Seminar on Solid State Engineering 2D

    2020

  23. Seminar on Solid State Engineering 2C

    2020

  24. Seminar on Solid State Engineering 2B

    2020

  25. Seminar on Solid State Engineering 2A

    2020

  26. Graduation Thesis B

    2020

  27. Graduation Thesis A

    2020

  28. Advanced Condensed Matter Physics

    2020

  29. Core Applied Physics

    2020

  30. 物理工学セミナー

    2020

  31. 量子基礎工学特論

    2017

  32. 量子力学A

    2017

  33. 物性物理のすすめ

    2016

  34. 量子力学A

    2016

  35. 量子力学A

    2015

  36. 量子基礎工学特論

    2015

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To the head of Teaching Experience (On-campus).▲

Teaching Experience (Off-campus) 1

  1. 内部自由度を持った原子気体BECの物理

    2016.4 - 2017.3 （Osaka City University）

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Social Contribution 11

  1. ンライン市民講演会「グラフェンの世界」、ー炭素のナノシートが拓く未来ー

    Role(s)：Planner,　Organizing member

    日本物理学会名古屋支部  オンライン  2023.12

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    Audience： High school students,　College students,　Graduate students,　Teachers,　Guardians,　Researchesrs,　General,　Scientific,　Company,　Civic organization,　Governmental agency,　Media

    Type：Lecture

  2. 女子学生のための理系進学セミナー：物理学ってなに？

    Role(s)：Presenter,　Planner,　Organizing member

    日本物理学会名古屋支部  名古屋大学東山キャンパス  2023.6

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    Audience： Junior students,　High school students,　Guardians

    Type：Seminar, workshop

  3. オンライン市民講演会「“かたち” の数学と物理」、ートポロジーと量子計算、超伝導ー

    Role(s)：Planner,　Organizing member

    日本物理学会名古屋支部  オンライン  2023.1

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    Audience： Junior students,　High school students,　College students,　Graduate students,　Teachers,　Guardians,　Researchesrs,　General,　Scientific,　Company,　Civic organization

    Type：Lecture

  4. 女子中高生理系進学推進セミナー2022

    Role(s)：Appearance,　Lecturer

    名古屋大学工学研究科  2022.8

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    Audience： Junior students,　High school students

    Type：Lecture

  5. テクノWebinar名大　女子学生のための工学オンラインセミナー

    Role(s)：Appearance,　Organizing member

    名古屋大学工学研究科  2021.12

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    Audience： Junior students,　High school students,　College students,　Graduate students,　Teachers,　Guardians,　Researchesrs

    Type：Science cafe

  6. 女子中高生理系進学推進セミナー2021

    Role(s)：Appearance,　Media coverage,　Lecturer

    名古屋大学工学研究科  2021.8

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    Audience： Junior students,　High school students

    Type：Lecture

  7. オープンキャンパス 2021 模擬講義

    Role(s)：Appearance,　Lecturer

    名古屋大学工学研究科  2021.8

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    Audience： High school students

    Type：Lecture

  8. 「テクノWebinar名大　工学女子の人生デザイン」　座談会

    Role(s)：Panelist

    名古屋大学工学研究科  2020.11

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    Audience： Junior students,　High school students,　College students,　Graduate students,　Teachers,　Guardians,　Researchesrs

    Type：Science cafe

  9. 女子中高生理系進学推進セミナー2020

    Role(s)：Appearance,　Media coverage

    名古屋大学工学研究科  2020.8

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    Audience： Junior students,　High school students

    Type：Internet

  10. 愛知県立明和高校SSH運営指導委員

    Role(s)：Advisor

    2020.5

    　More details

    Audience： High school students

    Type：Research consultation

  11. Meidai MIRAI Global Science Campus

    Role(s)：Lecturer

    Nagoya University  Higashiyama Campus, Nagoya Univsersity  2017.7

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    Audience： High school students

    Type：Lecture

    I gave a lecture about my research to high school students.

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Media Coverage 2

  1. 名大など、乱れた量子系における量子数ゆらぎと量子もつれの成長則を発見 Internet

    マイナビ  マイナビニュース TECH+  https://news.mynavi.jp/techplus/article/20210825-1955964/  2021.8

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    Author：Other 

  2. 朝日新聞「先端人」 Newspaper, magazine

    朝日新聞  2020.4

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    Author：Other 

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