研究者詳細 - 山川　洋一

論文 - 山川　洋一

分割表示 78 件中 1 - 20 件目／全件表示 >>

Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals 査読有り国際誌

Rina Tazai, Youichi Yamakawa, Hiroshi Kontani

Nature Communications 14 巻頁： 7845-1 - 7845-9 2023年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Recent experiments on geometrically frustrated kagome metal AV3Sb5 (A = K, Rb, Cs) have revealed the emergence of the charge loop current (cLC) order near the bond order (BO) phase. However, the origin of the cLC and its interplay with other phases have been uncovered. Here, we propose a novel mechanism of the cLC state, by focusing on the BO phase common in kagome metals. The BO fluctuations in kagome metals, which emerges due to the Coulomb interaction and the electron-phonon coupling, mediate the odd-parity particle-hole condensation that gives rise to the topological current order. Furthermore, the predicted cLC+BO phase gives rise to the Z3-nematic state in addition to the giant anomalous Hall effect. The present theory predicts the close relationship between the cLC, the BO, and the nematicity, which is significant to understand the cascade of quantum electron states in kagome metals. The present scenario provides a natural understanding.

DOI： 10.1038/s41467-023-42952-6

Mechanism of exotic density-wave and beyond-Migdal unconventional superconductivity in kagome metal AV(3)Sb(5) (A = K, Rb, Cs) 査読有り国際誌

Tazai Rina, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

SCIENCE ADVANCES 8 巻 ( 13 ) 頁： eabl4108-1 - eabl4108-9 2022年4月

Odd-parity spin-loop-current order mediated by transverse spin fluctuations in cuprates and related electron systems 査読有り国際誌

Kontani Hiroshi, Yamakawa Youichi, Tazai Rina, Onari Seiichiro

PHYSICAL REVIEW RESEARCH 3 巻 ( 1 ) 頁： 013127-1 - 013127-13 2021年2月

Nematicity and Magnetism in FeSe and Other Families of Fe-Based Superconductors 査読有り国際誌

Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW X 6 巻 ( 2 ) 頁： 021032-1 - 021032-15 2016年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Nematicity and magnetism are two key features in Fe-based superconductors, and their interplay is one of the most important unsolved problems. In FeSe, the magnetic order is absent below the structural transition temperature Tstr=90 K, in stark contrast to the fact that the magnetism emerges slightly below Tstr in other families. To understand such amazing material dependence, we investigate the spin-fluctuation-mediated orbital order (nxz≠nyz) by focusing on the orbital-spin interplay driven by the strong-coupling effect, called the vertex correction. This orbital-spin interplay is very strong in FeSe because of the small ratio between the Hund’s and Coulomb interactions (J¯/U¯) and large dxz, dyz-orbital weight at the Fermi level. For this reason, in the FeSe model, the orbital order is established irrespective of the fact that the spin fluctuations are very weak, so the magnetism is absent below Tstr. In contrast, in the LaFeAsO model, the magnetic order appears just below Tstr both experimentally and theoretically. Thus, the orbital-spin interplay due to the vertex correction is the key ingredient in understanding the rich phase diagram with nematicity and magnetism in Fe-based superconductors in a unified way.

DOI： 10.1103/PhysRevX.6.021032

Web of Science

Sign-Reversing Orbital Polarization in the Nematic Phase of FeSe due to the C-2 Symmetry Breaking in the Self-Energy 査読有り

Onari Seiichiro, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW LETTERS 116 巻 ( 22 ) 頁： 227001-1 - 227001-6 2016年6月

Odd-parity bond order and induced nonreciprocal transport in the kagome metal CsTi3Bi5 driven by quantum interference 査読有り国際誌

J. Huang, Y. Yamakawa, R. Tazai, T. Morimoto, and H. Kontani

Physical Review B 111 巻頁： 125153-1 - 125153-13 2025年3月

Giant impurity effects on charge loop current order states in kagome metals 査読有り

S. Nakazawa, R. Tazai, Y. Yamakawa, S. Onari, and H. Kontani

Physical Review B 111 巻頁： 075161-1 - 075161-10 2025年2月

Real-Space Loop Current Pattern in Time-Reversal-Symmetry Breaking Phase in Kagome Metals 査読有り

Shimura, K; Tazai, R; Yamakawa, Y; Onari, S; Kontani, H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 93 巻 ( 3 ) 頁： 033704-1 - 033704-5 2024年3月

Superconductivity in Ternary Zirconium Telluride Zr6MTe2 with 3d Transition Metals 査読有り

Matsumoto, H; Yamakawa, Y; Okuma, R; Nishio-Hamane, D; Okamoto, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 93 巻 ( 2 ) 頁： 023705-1 - 023705-5 2024年2月

Superconductivity in Ternary Germanide ScPdGe and Silicide ScPdSi 査読有り

Shinoda, Y; Okamoto, Y; Yamakawa, Y; Takatsu, H; Kageyama, H; Hirai, D; Takenaka, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 93 巻 ( 2 ) 頁： 023701-1 - 023701-4 2024年2月

Low temperature phase transitions inside the CDW phase in the kagome metals AV3Sb5 (A=Cs, Rb, K): Significance of mixed-type Fermi surface electron correlations 査読有り

Jianxin Huang, Rian Tazai, Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani

Physical Review B 109 巻 ( 4 ) 頁： L041110-1 - L041110-6 2024年1月

Drastic magnetic-field-induced chiral current order and emergent current-bond-field interplay in kagome metals 査読有り国際誌 Open Access

Tazai, R; Yamakawa, Y; Kontani, H

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 121 巻 ( 3 ) 頁： e2303476121-1 - e2303476121-10 2024年1月

Superconductivity in Ternary Scandium Telluride Sc6MTe2 with 3d, 4d, and 5d Transition Metals 査読有り

Shinoda, Y; Okamoto, Y; Yamakawa, Y; Matsumoto, H; Hirai, D; Takenaka, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 92 巻 ( 10 ) 頁： 103701-1 - 103701-5 2023年8月

Rigorous formalism for unconventional symmetry breaking in Fermi liquid theory and its application to nematicity in FeSe

Tazai Rina, Matsubara Shun, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW B 107 巻 ( 3 ) 2023年1月

Correlation-driven electronic nematicity in the Dirac semimetal BaNiS2 査読有り

Butler Christopher John, Kohsaka Yuhki, Yamakawa Youichi, Bahramy Mohammad Saeed, Onari Seiichiro, Kontani Hiroshi, Hanaguri Tetsuo, Shamoto Shinichi

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 119 巻 ( 49 ) 頁： e2212730119-1 - e2212730119-8 2022年12月

d- and p-wave Quantum Liquid Crystal Orders in Cuprate Superconductors, Kappa-(BEDT-TTF)(2)X, and Coupled Chain Hubbard Models: Functional-renormalization-group Analysis

Tazai Rina, Yamakawa Youichi, Tsuchiizu Masahisa, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 90 巻 ( 11 ) 2021年11月

Unconventional orbital charge density wave mechanism in the transition metal dichalcogenide 1T-TaS2 査読有り

Hirata Toru, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW RESEARCH 3 巻 ( 3 ) 頁： L032053-1 - L032053-6 2021年8月

Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe

Kuwayama T., Matsuura K., Gouchi J., Yamakawa Y., Mizukami Y., Kasahara S., Matsuda Y., Shibauchi T., Kontani H., Uwatoko Y., Fujiwara N.

SCIENTIFIC REPORTS 11 巻 ( 1 ) 2021年8月

Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems 招待有り査読有り

Kontani Hiroshi, Tazai Rina, Yamakawa Youichi, Onari Seiichiro

ADVANCES IN PHYSICS 70 巻 ( 3 ) 頁： 355 - 443 2021年7月

Development of Spin Fluctuations under the Presence of d-wave Bond Order in Cuprate Superconductors 査読有り

Ando Satoshi, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 90 巻 ( 6 ) 頁： 063704-1 - 063704-5 2021年6月

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