Updated on 2024/10/18

写真a

 
SAITOH, Koh
 
Organization
Institute of Materials and Systems for Sustainability Advanced Measurement Technology Center (AMTC) Electron Nanoscopy Section Professor
Graduate School
Graduate School of Engineering
Title
Professor

Degree 1

  1. 博士（理学） （ 1997.3   東北大学 ） 

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Research Interests 1

  1. Development of measurement methods of atomic and electronic structures of condensed matters in nanometer area using electron microscopes. (1)Structure analysis of aperiodic crystals by various electron microscopies. (2)Development of a method of accurate lattice-strains measurement in nanometer area by convergent-beam electron diffraction and its application to semiconductor devices. (3)Studies of anisotropy of electronic structures by inelastic scattering accompanied by inner-shell excitation.

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Research Areas 3

  1. Others / Others  / Metallic Physical Properties

  2. Others / Others  / Physical Properties II

  3. Others / Others  / Physical Properties I

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Current Research Project and SDGs 5

  1. Visualization of the anisotropy of unoccupied orbitals near the Fermi level

  2. Lattice strain and electron conductivity of semiconductors in nanometer area

  3. Structural analysis of aperiodic crystals using advanced electron microscopy

  4. Development of measurement methods of atomic and electronic structures of condensed matters in nanometer area using electron microscopes. (1)Structure analysis of aperiodic crystals. 2)Accurate lattice-strains measurement method. 3)Studies of anisotropy of electronic structures.

  5. 電子らせん波の生成および新規イメージング手法の開発

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Research History 11

  1. Nagoya University   Institute of Materials and Systems for Sustainability   Professor

    2015.10

  2. Nagoya University   Institute of Materials and Systems for Sustainability Advanced Measurement Technology Center Electron Nanoscopy Section   Professor

    2015.10

  3. Nagoya University   EcoTopia Science Institute   Professor

    2015.4 - 2015.9

  4. Nagoya University   EcoTopia Science Institute   Associate professor

    2009.4 - 2015.3

  5. Nagoya University   EcoTopia Science Institute   Lecturer

    2006.4 - 2009.3

  6. Nagoya University   EcoTopia Science Institute   Lecturer

    2004.7 - 2006.3

  7. National Institute of Advanced Industrial Science and Technology   Researcher

    2003.12 - 2004.6

  8. Tohoku University   Institute of Multidisciplinary Research for Advanced Materials   Assistant

    2001.4 - 2003.11

  9. Technische Universitaet Darmstadt   Humboldt research fellow

    2000.4 - 2001.2

  10. Friedlich Schiller University Jena   Guest scientist

    1999.9 - 1999.10

  11. Tohoku University   Institute for Scientific Measurements   Assistant

    1997.4 - 2001.3

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Education 3

  1. Tohoku University

    1994.4 - 1997.3

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    Country： Japan

  2. Tohoku University

    1992.4 - 1994.3

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    Country： Japan

  3. Yamagata University

    1988.4 - 1992.3

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Professional Memberships 4

  1. The Japanese Society of Microscopy

    2020.4

  2. International Union of Crystallography

    2003.4

  3. The Physical Society of Japan

    2002.4 - 2004.3

  4. The Crystallographic Society of Japan

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Awards 1

  1. 本多記念研究奨励賞

    1999.5   （財）本多記念会  

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    Country：Japan

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Papers 84

  1. Surface sensitivity of atomic-resolution secondary electron imaging

    Saitoh, K; Oyobe, T; Igarashi, K; Sato, T; Matsumoto, H; Inada, H; Endo, T; Miyata, Y; Usami, R; Takenobu, T

    MICROSCOPY     2024.9

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

    DOI： 10.1093/jmicro/dfae041

    Web of Science

    PubMed

  2. Near-field electron ptychography using full-field structured illumination

    Tamaki, H; Saitoh, K

    MICROSCOPY     2024.7

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

    DOI： 10.1093/jmicro/dfae035

    Web of Science

    PubMed

  3. Development of silicon-on-insulator direct electron detector with analog memories in pixels for sub-microsecond imaging

    Ishida, T; Sugie, K; Miyoshi, T; Ishida, Y; Saitoh, K; Arai, Y; Kuwahara, M

    MICROSCOPY     2024.6

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

    DOI： 10.1093/jmicro/dfae029

    Web of Science

    PubMed

  4. Giant impurity effect on anomalous Hall effect of Mn<sub>3</sub>Sn

    Yano, R; Kihara, S; Yoneda, M; Vu, HTN; Suto, H; Katayama, N; Yamaguchi, T; Kuwahara, M; Suzuki, MT; Saitoh, K; Kashiwaya, S

    JOURNAL OF CHEMICAL PHYSICS   Vol. 160 ( 18 )   2024.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of Chemical Physics  

    Mn3Sn is an anomalous Hall effect (AHE) antiferromagnet that exhibits the hysteretic AHE in antiferromagnetic (AFM) phase at room temperature. We report that whisker Mn3Sn crystals grown by the flux method exhibit a non-hysteretic AHE at mid-to-low temperatures when the whisker Mn3Sn is surrounded by a thin layer of ferromagnetic Mn2−xSn. These crystals exhibit a hysteretic AHE above 275 K due to the spin alignment of the inverse triangular lattice, which is similar to other crystals. However, upon cooling the crystal, it exhibits a non-hysteretic AHE with a spiral AFM spin structure at 100-200 K. We concluded that the non-hysteretic AHE is induced at the interface of Mn2−xSn/Mn3Sn. We believe that the scalar-spin chirality in the spiral AFM phase of Mn3Sn, modulated by Mn2−xSn through the magnetic proximity effect, produces the AHE. This discovery opens a new avenue for tailoring the AHE by magnetic layers.

    DOI： 10.1063/5.0195211

    Web of Science

    Scopus

    PubMed

  5. Phase retrieval of electron rocking curves using total variation and total squared variation regularizations

    Shichi, A; Ishizuka, H; Saitoh, K

    MICROSCOPY   Vol. 73 ( 3 ) page： 262 - 274   2023.11

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

    In this study, a new method for the phase retrieval of electron rocking curves observed using convergent-beam electron diffraction, which is applicable to the determination of three-dimensional lattice displacement fields along the beam direction, is proposed. Total variation and total squared variation regularizations are introduced for phase retrieval to suppress overfitting to noise or background signals in the rocking curves and to reproduce the sparse characteristics of displacement fields, which exist only near lattice defects. The results show that the proposed algorithm is effective for rocking curves modulated by the dynamical effect of electron diffraction. The accuracy of phase reconstruction using the proposed method is also discussed. Phase retrieval of the experimental rocking curves obtained from a stacking fault in stainless steel is demonstrated.

    DOI： 10.1093/jmicro/dfad048

    Web of Science

    Scopus

    PubMed

  6. Superconductivity in High-Entropy Antimonide M1-x Pt x Sb (M = Equimolar Ru, Rh, Pd, and Ir)

    Hirai Daigorou, Uematsu Naoto, Saitoh Koh, Katayama Naoyuki, Takenaka Koshi

    INORGANIC CHEMISTRY   Vol. 62 ( 35 ) page： 14207 - 14215   2023.8

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

    DOI： 10.1021/acs.inorgchem.3c01364

    Web of Science

  7. Measurement and correction of TEM image distortion using arbitrary samples

    Tamaki Hirokazu, Saitoh Koh

    MICROSCOPY     2023.2

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

    DOI： 10.1093/jmicro/dfad015

    Web of Science

  8. Carbonization of a Molybdenum Substrate Surface and Nanoparticles by a One-Step Method of Femtosecond Laser Ablation in a Hexane Solution Reviewed

    Y. Tanaka, X. Yu, S. Terakawa, T. Ishida, K. Saitoh, H. Zhang, T. Asaka, F. Itoigawa, M. Kuwahara, S. Ono

    ACS Omega   Vol. 8 ( 8 ) page： 7932 - 7939   2023

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

  9. Static Hydrophobic Cuprous Oxide Surface Fabricated via One-Step Laser-Induced Oxidation of a Copper Substrate Reviewed

    X. Yu, Y. Tanaka, T. Kakiuchi, T. Ishida, K. Saitoh, F. Itoigawa, M. Kuwahara, S. Ono

    Micromachines   Vol. 14 ( 1 ) page： 185   2023

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

  10. Orbital angular momentum-resolved convergent-beam electron diffraction by the post-selected injection of electron beam

    Saitoh Koh, Yonezawa Tatsuya, Nambu Hiroki, Tanimura Shogo, Uchida Masaya

    MICROSCOPY   Vol. 71 ( 6 ) page： 374 - 379   2022.12

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

    DOI： 10.1093/jmicro/dfac046

    Web of Science

  11. Extension of focal depth by electron quasi-Bessel beam in atomic-resolution scanning transmission electron microscopy

    Ishida Takafumi, Owaki Takeshi, Ohtsuka Masahiro, Kuwahara Makoto, Saitoh Koh, Kawasaki Tadahiro

    APPLIED PHYSICS EXPRESS   Vol. 15 ( 11 )   2022.11

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

    DOI： 10.35848/1882-0786/ac96ce

    Web of Science

  12. Transient electron energy-loss spectroscopy of optically stimulated gold nanoparticles using picosecond pulsed electron beam

    Kuwahara Makoto, Mizuno Lira, Yokoi Rina, Morishita Hideo, Ishida Takafumi, Saitoh Koh, Tanaka Nobuo, Kuwahara Shota, Agemura Toshihide

    APPLIED PHYSICS LETTERS   Vol. 121 ( 14 )   2022.10

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

    DOI： 10.1063/5.0108266

    Web of Science

  13. Surface cleavage of zinc oxide induced by femtosecond laser irradiation

    Yu X., Takeda Y., Hamasaki S., Ishida T., Kuwahara M., Saitoh K., Itoigawa F., Ono S.

    Optics InfoBase Conference Papers     2022

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optics InfoBase Conference Papers  

    Cleavage along the crystalline and cleavage-melt shift were observed on the surface of a ZnO substrate when it was irradiated by single and multiple femtosecond laser pulses, respectively.

    DOI： 10.1364/CLEOPR.2022.P_CTh5_03

    Scopus

  14. Surface cleavage of zinc oxide induced by femtosecond laser irradiation

    Yu X., Takeda Y., Hamasaki S., Ishida T., Kuwahara M., Saitoh K., Itoigawa F., Ono S.

    2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022 - Proceedings     2022

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022 - Proceedings  

    Cleavage along the crystalline and cleavage-melt shift were observed on the surface of a ZnO substrate when it was irradiated by single and multiple femtosecond laser pulses, respectively.

    DOI： 10.1109/CLEO-PR62338.2022.10432217

    Scopus

  15. Compressed Sensing in Transmission Electron Microscopy

    Nomura Yuki, Anada Satoshi, Yamamoto Kazuo, Hirayama Tsukasa, Saitoh Koh

    KENBIKYO   Vol. 56 ( 3 ) page： 116 - 123   2021.12

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Microscopy  

    <p>The key of compressed sensing technology is to find out the feature elements (bases) contained in the original signal from few sampled measurements. In this paper, we introduce theories of compressed sensing techniques based on machine learning and their application to scanning transmission electron microscopy, electron energy loss spectroscopy, and electron holography, in which the bases are extracted by suitable statistical signal processing (sparse coding and tensor decomposition).</p>

    DOI： 10.11410/kenbikyo.56.3_116

    CiNii Research

  16. Observation of domain wall bimerons in chiral magnets

    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 )   2021.6

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

    DOI： 10.1038/s41467-021-23845-y

    Web of Science

  17. Denoising of series electron holograms using tensor decomposition

    Nomura Yuki, Yamamoto Kazuo, Anada Satoshi, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

    MICROSCOPY   Vol. 70 ( 3 ) page： 255 - 264   2021.6

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

    DOI： 10.1093/jmicro/dfaa057

    Web of Science

  18. Performance of a silicon-on-insulator direct electron detector in a low-voltage transmission electron microscope

    Ishida Takafumi, Shinozaki Akira, Kuwahara Makoto, Miyoshi Toshinobu, Saitoh Koh, Arai Yasuo

    MICROSCOPY   Vol. 70 ( 3 ) page： 321 - 325   2021.6

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

    DOI： 10.1093/jmicro/dfaa072

    Web of Science

  19. Intensity Interference in a Coherent Spin-Polarized Electron Beam

    Kuwahara Makoto, Yoshida Yuya, Nagata Wataru, Nakakura Kojiro, Furui Masato, Ishida Takafumi, Saitoh Koh, Ujihara Toru, Tanaka Nobuo

    PHYSICAL REVIEW LETTERS   Vol. 126 ( 12 )   2021.3

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

    DOI： 10.1103/PhysRevLett.126.125501

    Web of Science

  20. Slow dynamics of disordered zigzag chain molecules in layered LiVS2 under electron irradiation

    Katayama Naoyuki, Kojima Keita, Yamaguchi Tomoki, Hattori Sosuke, Tamura Shinya, Ohara Koji, Kobayashi Shintaro, Sugimoto Koudai, Ohta Yukinori, Saitoh Koh, Sawa Hiroshi

    NPJ QUANTUM MATERIALS   Vol. 6 ( 1 )   2021.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41535-021-00313-w

    Web of Science

  21. HAADF-STEM observation of unique quasicrystalline precipitates from solid solution in Mg-Cd-Yb system

    Ohhashi Satoshi, Saitoh Koh, Kato Akira, Tsai An-Pang

    MATERIALS CHARACTERIZATION   Vol. 172   2021.2

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

    DOI： 10.1016/j.matchar.2020.110705

    Web of Science

  22. Denoising of series electron holograms using tensor decomposition Invited Reviewed

    Yuki Nomura, Kazuo Yamamoto, Satoshi Anada, Tsukasa Hirayama, Emiko Igaki, Koh Saitoh

    Microscopy     2020.9

  23. Development of a voltage-applicable heating specimen holder for in situ observations of solid oxide fuel cells with an environmental transmission electron microscope

    Ishida Takafumi, Hiroshima Hideto, Higuchi Kimitaka, Tomita Masahiro, Saitoh Koh, Tanji Takayoshi

    SURFACE AND INTERFACE ANALYSIS   Vol. 52 ( 9 ) page： 584 - 590   2020.9

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

    DOI： 10.1002/sia.6788

    Web of Science

  24. <i>Operando</i> STEM-EELS of an All-solid-state Li-ion Battery Using a Multi-variate Analysis Reviewed

    Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

    KENBIKYO   Vol. 55 ( 2 ) page： 70 - 74   2020.8

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Microscopy  

    <p>All-solid-state lithium-ion batteries (LIBs) are promising candidates of next-generation secondary batteries that have the potential to overcome the problems of conventional LIBs with liquid-electrolytes. However, it is known that the Li-ion conduction resistance at the electrode/solid-electrolyte interface limits their performance. It is important to elucidate interfacial phenomena at the nanometer scale and feed it back to material design. In this paper, we use scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) to dynamically observe the distribution of Li and the electronic state of transition metals in an all-solid-state LIB during the charge-discharge reactions. The distribution of Li was quantitatively observed under dynamic conditions by applying multivariate analysis. The results showed that Li ions were heterogeneously extracted/inserted during the charge/discharge reaction, and that the activity of the electrochemical reaction depended on the Li-ion concentration at the original state (as deposition). The origin of the interfacial resistance was the electrochemically inactive Co<sub>3</sub>O<sub>4</sub> formed at 10–20 nm near the interface.</p>

    DOI： 10.11410/kenbikyo.55.2_70

    CiNii Research

  25. Visualization of Lithium Transfer Resistance in Secondary Particle Cathodes of Bulk-Type Solid-State Batteries

    Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

    ACS ENERGY LETTERS   Vol. 5 ( 6 ) page： 2098 - 2105   2020.6

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

    DOI： 10.1021/acsenergylett.0c00942

    Web of Science

  26. Dynamic imaging of lithium in solid-state batteries by operando electron energy-loss spectroscopy with sparse coding

    Nomura Yuki, Yamamoto Kazuo, Fujii Mikiya, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

    NATURE COMMUNICATIONS   Vol. 11 ( 1 )   2020.6

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

    DOI： 10.1038/s41467-020-16622-w

    Web of Science

  27. Atom displacement detection of perovskite oxide in high resolution HAADF-STEM images by dictionary learning

    Hattori Sosuke, Nomura Yuki, Saitoh Koh

    Meeting Abstracts of the Physical Society of Japan   Vol. 75.1 ( 0 ) page： 2279 - 2279   2020

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.75.1.0_2279

    CiNii Research

  28. Efficient Measurement of the Orbital-Angular-Momentum Spectrum of an Electron Beam via a Dammann Vortex Grating

    Noguchi Yuuki, Nakayama Shota, Ishida Takafumi, Saitoh Koh, Uchida Masaya

    PHYSICAL REVIEW APPLIED   Vol. 12 ( 6 )   2019.12

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

    DOI： 10.1103/PhysRevApplied.12.064062

    Web of Science

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

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

    DOI： 10.1103/PhysRevLett.123.137203

    Web of Science

  30. Creating electron phase holograms using femtosecond laser interference processing

    Uesugi Yuuki, Fukushima Ryota, Saitoh Koh, Sato Shunichi

    OPTICS EXPRESS   Vol. 27 ( 15 ) page： 20958 - 20964   2019.7

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

    DOI： 10.1364/OE.27.020958

    Web of Science

  31. Laser Interference Processing of Electron Phase Holograms by Using a Femtosecond Laser

    Uesugi Yuuki, Fukushima Ryota, Sato Shunichi, Saitoh Koh

    Conference on Lasers and Electro-Optics:Science and Innovations 2019     page： SF1E.5.   2019.5

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  32. Laser Interference Processing of Electron Phase Holograms by Using a Femtosecond Laser

    Uesugi Y., Fukushima R., Sato S., Saitoh K.

    2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings     2019.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings  

    Electron phase hologram was fabricated by a single-shot femtosecond laser interference processing. The generation of electron vortices from the fabricated hologram was demonstrated with higher diffraction efficiency than that of amplitude hologram as expected.

    DOI： 10.23919/CLEO.2019.8750423

    Scopus

  33. Direct Observation of a Li-ionic Space-Charge Layer Formed at an Electrode/Solid-Electrolyte Interface

    Y. Nomura, K.Yamamoto, T. Hirayama, S. Ouchi, E. Igaki, K. Saitoh

    Angewandte Chemie   Vol. 58 ( 16 ) page： 5292 - 5296   2019.4

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

    DOI： 10.1002/anie.201814669

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  34. Quantitative Operando Visualization of Electrochemical Reactions and Li Ions in All-Solid-State Batteries by STEM-EELS with Hyperspectral Image Analyses

    Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Ohkawa Mayumi, Igaki Emiko, Hojo Nobuhiko, Saitoh Koh

    NANO LETTERS   Vol. 18 ( 9 ) page： 5892-5898   2018.9

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

    DOI： 10.1021/acs.nanolett.8b02587

    Web of Science

  35. Electric shielding films for biased TEM samples and their application to in situ electron holography

    Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Saitoh Koh

    MICROSCOPY   Vol. 67 ( 3 ) page： 178-186   2018.6

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

    DOI： 10.1093/jmicro/dfy018

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  36. Coherent pulse beam in spin-polarized TEM using an NEA photocathode

    Kuwahara M., Ujihara T., Saitoh K., Tanaka N.

    2018 31ST INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE (IVNC)     page： .   2018

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

    Web of Science

  37. Observation of localized surface plasmon of gold octahedral nanoparticles using STEM-EELS

    Mizuno Rira

    Meeting Abstracts of the Physical Society of Japan   Vol. 73.1 ( 0 ) page： 2499 - 2499   2018

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.73.1.0_2499

    CiNii Research

  38. Nearly nondiffracting electron lattice beams generated by polygonal slits

    H. Nambu, Y. Noguchi, K. Saitoh, M. Uchida

    Microscopy   Vol. 66 ( 4 ) page： 295 - 299   2017.8

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

    A method for generating electron lattice beams carrying vortices using nanofabricated polygonal slits in a transmission electron microscope is proposed. Experimental and simulation study of the intensity of the beams verified their Bessel beam-like nearly non- diffracting behavior. Phase analysis using a diffractive imaging method found arrays of quantized vortices, forming an electron beam lattice with cylindrical intensity distribu- tion in the propagation direction. Such vortex lattice beams may be used in a variety of applications including nanofabrication, particle manipulation or a new electron imaging method.

    DOI： 10.1093/jmicro/dfx020

    Web of Science

  39. Introduction to Electron Phase Imaging

    Saitoh Koh

    KENBIKYO   Vol. 52 ( 1 ) page： 3   2017.4

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Microscopy  

    DOI： 10.11410/kenbikyo.52.1_3

    CiNii Research

  40. The Boersch effect in a picosecond pulsed electron beam emitted from a semiconductor photocathode Reviewed

    M. Kuwahara, Y. Nambo, K. Aoki, K. Sameshima, X. Jin, T. Ujihara, H. Asano, K. Saitoh, Y. Takeda, and N. Tanaka

    Applied Physics Letters   Vol. 109   page： 013108   2016

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

  41. Strain evolution of epitaxial tetragonal-like BiFeO3 thin films on LaAlO3(001) substrates prepared by sputtering and their bulk photovoltaic effect Reviewed

    S. Nakashima, T. Uchida, K. Doi, K. Saitoh, H. Fujisawa, O. Sakata, Y. Katsuya, N. Tanaka, and M. Shimizu

    Japanese Journal of Applied Physics   Vol. 55   page： 101501   2016

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

  42. Electron Diffractive imaging using Fork-Shaped Grating Masks Reviewed

    H. Nambu, K. Saitoh, M. Uchida

    AMTC Letters   Vol. 5   page： 248-249   2016

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

  43. In situ Observation of Interfaces between Metal Electrode and Solid Oxide Electrolyte Prepared by FIB Reviewed

    T. Ishida, T. Tanji, M. Tomita, K, Higuchi, K. Saitoh

    AMTC Letters   Vol. 5   page： 62-63   2016

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

  44. Determination of a 3D Displacement Field at a Vicinity of a GeSn/Ge Interface by the Phse Retrieval of Electron Rocking Curves Reviewed

    M. Miura, S. Fujinami, K. Saitoh, N. Tanaka, O. Nakatsuka, S. Zaima

    AMTC Letters   Vol. 5   page： 46-47   2016

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

  45. Measuring the Orbital Angular Momentum of Electron Vortex Beams Using a Forked Grating Reviewed

    K. Saitoh, Y. Hasegawa, K. Hirakawa, N. Tanaka, and M. Uchida

    Physical Review Letters   Vol. 111   page： 074801   2013.8

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

    The present study experimentally examines how an electron vortex beam with orbital angular momentum (OAM) undergoes diffraction through a forked grating. The nth-order diffracted electron vortex beam after passing through a forked grating with a Burgers vector of 1 shows an OAM transfer of n@. Hence, the diffraction patterns become mirror asymmetric owing to the size difference between the electron beams. Such a forked grating, when used in combination with a pinhole located at the diffraction plane, could act as an analyzer to measure the OAM of input electrons.

    DOI： 10.1103/PhysRevLett.111.074801

  46. Propagation Dynamics of Electron Vortex Pairs Reviewed

    Y. Hasegawa, K. Saitoh, N. Tanaka, and M. Uchida

    Journal of the Physical Society of Japan   Vol. 82   page： 073402   2013.6

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

    Electron vortex beams carrying orbital angular momentum have been experimentally realized very recently. Here, we present the generation and propagation dynamics of electron vortex pairs embedded in a single beam, using a nanofabricated holographic grating. The rotation of two electron vortices with the same topological charges and the annihilation of two electron vortices with opposite charges were observed. The experimental results are well explained by the Gouy phase shift and confirmed by numerical simulations of the propagation. The results of this study may help develop an intuitive understanding of electron vortex motion and give a new viewpoint for analyzing electron microscope images and phase change in a crystal.

    DOI： 10.7566/JPSJ.82.073402

  47. らせん状の波面をもつ電子波の生成、伝播、干渉 Invited Reviewed

    齋藤晃、長谷川裕也、内田正哉

    顕微鏡   Vol. 48 ( 1 ) page： 39-46   2013.4

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    Authorship：Lead author   Language：Japanese  

  48. Young's Interference Experiment with Electron Beams Carrying Orbital Angular Momentum Reviewed

    Y. Hasegawa, K. Saitoh, N. Tanaka, S. Tanimura and M. Uchida

    Journal of the Physical Society of Japan   Vol. 82   page： 033002   2013.2

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    A Young's-type double-slit experiment using electron beams carrying orbital angular momentum (OAM) is demonstrated in a transmission electron microscope. Each of the slits is replaced by a grating mask with a fork dislocation, which generates electron beams with OAM as diðracted beams. Interference fringes produced by two diðracted electron beams with OAM appear at the observation screen. The interference fringe patterns exhibit dislocation features depending on the topological charges of the two electron beams. The experimental results clearly show the wave nature of the electron beams with OAM and gives potential applications in electron physics and quantum mechanics.

    DOI： 10.7566/JPSJ.82.033002

  49. 30-kV spin-polarized transmission electron microscope with GaAs-GaAsP strained superlattice photocathode Reviewed

    M. Kuwahara, S. Kusunoki, X. G. Jin, T. Nakanishi, Y. Takeda, K. Saitoh, T. Ujihara, H. Asano, and N. Tanaka

      Vol. 101 ( 3 ) page： 033102   2012

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    DOI： 033102

  50. Electron interference from an amorphous thin film on a crystal transmission electron microscopy specimen Reviewed

    Rodney A. Herring, Koh Saitoh, Takayoshi Tanji, and Nobuo Tanaka

    Journal of Electron Microscopy   Vol. 61   page： 17-23   2012

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  51. Production of electron vortex beams carrying large orbital angular momentum using spiral zone plates Reviewed

    Koh Saitoh, Yuya Hasegawa, Nobuo Tanaka, and Masaya Uchida

    Journal of Electron Microscopy   Vol. 61 ( 3 ) page： 171-177   2012

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  52. Analysis of thickness modulation in GaAs/GaAsP strained superlattice by TEM observation Invited Reviewed

    Xiuguang Jin, Hirotaka Nakahara, Koh Saitoh, Takashi Saka, Toru Ujihara, Nobuo Tanaka, Yoshikazu Takeda

    Journal of Crystal Growth   Vol. 353   page： 84-87   2012

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    DOI： 84-87

  53. HOLZ線図形をもちいたSiGe/Si界面近傍の格子湾曲および伸張歪みの解析 Invited Reviewed

    齋藤晃

    まてりあ   Vol. 51 ( 8 ) page： 371-378   2012

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    DOI： 371-378

  54. 内殻励起をともなう非弾性散乱をもちいた電子構造異方性解析 Invited Reviewed

    齋藤晃

    顕微鏡   Vol. 47 ( 4 ) page： 228-237   2012

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  55. Observation of the hole state symmetry of MgB2 by inelastic scattering of fast electrons accompanied by boron K-shell excitation Reviewed

    K. Saitoh, K. Momonoi, N. Tanaka, and S. Onari

    Journal of Applied Physics   Vol. 112   page： 113920   2012

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  56. Three-dimensional reconstruction of the atomic arrangement of icosahedral quasicrystals by binary discrete tomography Reviewed

    Y. Ishibashi, H. Sugiura, K. Saitoh, and N. Tanaka

    Philosophical Magazine Letters   Vol. 91 ( 9 ) page： 632-639   2011

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    DOI： 632-639

  57. Automated characterization of bending and expansion of a lattice of a Si substrate near a SiGe/Si interface by using split HOLZ line patterns Reviewed

    K. Saitoh, Y. Yasuda, M. Hamabe and N. Tanaka

    J. Electron Microsc.   Vol. 59   page： 367-378   2010.10

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  58. Coherent electron interference from amorphous TEM specimens Reviewed

    R. A. Herring, K. Saitoh, N. Tanaka and T. Tanji

    J. Electron Microsc.   Vol. 59   page： 321-330   2010.10

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  59. Atom-column distinction by Kikuchi pattern observed by an aberration-corrected convergent electron probe Reviewed

    K. Saitoh, Y. Tatara and N. Tanaka

    J. Electron Microsc.   Vol. 59   page： 387-394   2010.10

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  60. Factors Affecting Extreme Ultraviolet Reflectivity of Mo/Si Multilayer FilmsSynthesized by Superconducting Magnetron Sputtering Reviewed

    Uichiro Mizutani, Takashi Yamaguchi, Tetsuya Tomofuji, Yousuke Yanagi,Yoshitaka Itoh, Koh Saitoh, Nobuo Tanaka, Noriaki Matsunami, and Hiroshi Ikuta

    Japanese Journal of Applied Physics   Vol. 48   page： 025507-1-6   2009.2

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  61. Observation of the three-dimensional q-dependence of inelastic scattering cross-section of the K-shell excitation of graphite Reviewed

    K. Saitoh, K. Nagasaka and N. Tanaka

    International Journal of Advanced Microscopy and Theoretical Calculations   Vol. 1   page： 92   2008.6

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  62. Structure refinement of a decagonal Al72Ni20Co8 quasicrystal by using convergent-beam electron diffraction

    Hiroki Murakami, Koh Saitoh, Nobuo Tanaka and An Pang Tsai

    International Journal of Advanced Microscopy and Theoretical Calculations   Vol. 1   page： 88-89   2008.6

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  63. Automated lattice-parameter determination by using HOLZ line patterns

    Koh Saitoh, Yoshifumi Yasuda and Nobuo Tanaka

    International Journal of Advanced Microscopy and Theoretical Calculations   Vol. 1   page： 90-91   2008.6

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  64. Structure refinement of a decagonal quasicrystal of Al72Ni20Co8by convergent-beam electron diffraction Reviewed

    Koh Saitoh, Hiroki Murakami and Nobuo Tanaka

    Zeitschrift fuer Kristallographie   Vol. 223   page： 859-862   2008

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    Structure refinement of a water quenched alloy of Al72Ni20Co8, which is known as a highly ordered decagonal quasicrystal, has been carried out by quantitative comparison of experimental and simulated intensities of convergent-beam electron diffraction (CBED) patterns. In the present study, higher-order Laue zone reflections, whose intensities are sensitively changed with atom positions, have been used for the refinement of atom position parameters in the quasiperiodic directions. The refined parameters have been compared with the results obtained by X-ray diffraction.

  65. 収束電子回折法によって明らかにしたCd系正20面体準結晶の特異な対称性 Invited

    齋藤 晃、横澤忠洋

    日本結晶学会誌   Vol. 49   page： 34-39   2007

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  66. ALCHEMI study of chemical order in Al-Cu-Co decagonal quasicrystals Reviewed

    K. Saitoh and A. P. Tsai

    Philosophical Magazine   Vol. 87 ( 18-21 ) page： 2741 - 2746   2007

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  67. Structural disorder of the atom cluster in a highly-ordered decagonal quasicrystal of Al72Ni20Co8 Reviewed

    K. Saitoh, N. Tanaka, A. P. Tsai and K. Ishizuka

    Philosophical Magazine   Vol. 87 ( 18-21 ) page： 2733 - 2739   2007

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  68. Observation of the anisotropy of the inelastic scattering of fast electrons accompanied by the K-shell ionization of a carbon nanotube Reviewed

    K. Saitoh, K. Nagasaka and N. Tanaka

    Journal of Electron Microscopy   Vol. 55 ( 6 ) page： 281 - 288   2006

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  69. Direct observation of six-membered rings in the upper and lower walls of a single-wall carbon nanotube by spherical aberration-corrected HRTEM Reviewed

    K. Hirahara, K. Saitoh, J. Yamasaki and N. Tanaka

    NANO LETTERS   Vol. 6   page： 1778   2006

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  70. Direct observation of oxygen atoms in rutile titanium dioxide by spherical aberration corrected high-resolution transmission electron microscopy Reviewed

    K. Yoshida, T. Kawai, T. Nambara, S. Tanemura, K. Saitoh and N. Tanaka

    Nanotechnology   Vol. 17   page： 3944−3950   2006

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  71. HAADF-STEM法による高分解能Z コントラスト像観察 Invited

    齋藤 晃

    日本結晶学会誌   Vol. 47   page： 9-14   2005

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    Authorship：Lead author   Language：Japanese  

  72. In-situ HREM observation of the structural change from a fundamental-lattice decagonal quasicrystal of Al72Ni20Co8 to the S1 type superlattice phase Reviewed

    K. Saitoh, T. Yokosawa, M. Tanaka, A. P. Tsai

    Ferroelectrics   Vol. 305   page： 253−256   2004

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  73. Formation of a superlattice order from a fundamental-lattice decagonal quasicrystal of Al72Ni20Co8 Reviewed

    K. Saitoh, T. Yokosawa, M. Tanaka, A. P. Tsai

    Journal of the Physical Society of Japan   Vol. 73 ( 7 ) page： 1786-1792   2004

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  74. ALCHEMI study of an S1-type superlattice-ordered decagonal quasicrystal of Al70 Ni18 Co12 Reviewed

    K. Saitoh, M. Tanaka and A. P. Tsai

    J. Non-Cryst. Solids   Vol. 334&335   page： 202-206   2004

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  75. High-temperature phase transition in lanthanum titanate perovskite La-0.64(Ti-0.92,Nb-0.08)O-3 Reviewed

    M. Yashima M, Mori M, Kamiyama T, Oikawa K, Hoshikawa A, Torii S, Saitoh K and Tsuda K

    Chemical Physics Letters   Vol. 375   page： 240-246   2003

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  76. Control of crystal polarity in a wurtzite crystal: ZnO films grown by plasma-assisted molecular-beam epitaxy on GaN Reviewed

    S.-K. Hong, T. Hanada, H.-J. Ko, Y. Chen, T. Yao, D. Imai, K. Araki, M. Shinohara, K. Saitoh, M. Terauchi

    Phys. Rev. B   Vol. 65   page： 115331   2002

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  77. Structural study of an Al-Co approximant by high-angle annular dark-field scanning transmission electron microscopy Reviewed

    T. Yokosawa, K. Saitoh, M. Tanaka, A. P. Tsai

    J. Phys. Soc. Jpn.   Vol. 71   page： 2601   2002

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  78. Stacking sequences of atom-clusters in decagonal quasicrystals and their approximants Reviewed

    Koh Saitoh and Michiyoshi Tanaka

    J. Alloys and Comps.   Vol. 342   page： 130 - 133   2002

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  79. Distinction between the Space Groups having Rotation and Screw Axes, Which are Combined with 2 Fold Rotation Axes, using the Coherent Convergent-beam Electron Diffraction Method Reviewed

    K. Saitoh, K. Tsuda, M. Terauchi, M. Tanaka

    Acta Crystallographica A   Vol. 57   page： 219 - 230   2001

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  80. Space-group determination of cubic and its superlattice-ordered rhombohedral phases of Zn63Mg23Er14 using the convergent-beam electron diffraction method Reviewed

    Koh Saitoh, Aris Kounis, Gerhert Miehe, Hartmut Fuess, Roland Sterzel and W. Assmus

    Z. Kristallogr.   Vol. 216   page： 1 - 4   2001

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  81. ALCHEMI study of an Al72Ni20Co8 decagonal quasicrystal Reviewed

    Koh Saitoh, Michiyoshi Tanaka, An Pang Tsai and Chris J. Rossouw

    J. Phys. Soc. Jpn.   Vol. 69   page： 2379 - 2382   2000

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  82. A new structural model of an Al72Ni20Co8 decagonal quasicrystal Reviewed

    Koh Saitoh, Kenji Tsuda and Michiyoshi Tanaka

    Journal of the Physical Society of Japan   Vol. 67   page： 2578 - 2580   1998

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  83. Experimental verification of the quasi-unit-cell model of quasicrystal structure Reviewed

    P. J. Steinhardt, H. C. Jeong, K. Saitoh, M. Tanaka, E. Abe, A. P. Tsai

    Nature   Vol. 396   page： 55   1998

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

  84. Structural Study of Al72Ni20Co8 Decagonal Quasicrystal by High-Angle Annular Dark-Field method Reviewed

    Koh Saitoh, Kenji Tsuda, Michiyoshi Tanaka, Kenji kaneko and An Pang Tsai

    Japanese Journal of Applied Physics   Vol. 36   page： L1400 - L1402   1997

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▼display all

To the head of Papers.▲

Books 1

  1. Convergent-beam electron diffraction IV

    M. Tanaka, M. Terauchi, K. Tsuda, K. Saitoh（ Role： Joint author）

    JEOL-Maruzen  2002 

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    Language：English

To the head of Books.▲

Presentations 64

  1. Phase retrieval of electron rocking curves with total variation and total squared variation International conference

    Koh Saitoh, Akihiro Shichi

    The 20th International Microscopy Congress  2023.9.12 

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    Event date： 2023.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Busan   Country：Korea, Republic of  

    This paper presents a method of phase retrieval of electron rocking curves observed in a convergent-beam electron diffraction (CBED) pattern by introducing total variation (TV) and total squared variation (TSV) regularizations. The TV and TSV regularizations contribute to suppress overfitting to noise and background in rocking curves and to reproduce the sparse characteristic of the variations of the lattice displacement fields such as stacking faults and dislocations, which are localized only in the vicinity of lattice defects. Conventionally, the phase retrieval using diffraction intensity has been limited to thin specimens, in which the diffraction intensities are approximated by the absolute squares of the Fourier transform of the structure of the specimen. The TV and TSV regularizations are also effective to suppress overfitting to dynamical diffraction intensities which are observed in CBED patterns taken from thick specimens.
    The phase retrieval by the present method is demonstrated by using kinematical and dynamical simulated CBED patterns with artificial noise and background. The phase retrieval of the experimental rocking curves taken from a stacking fault in a stainless steel is also demonstrated. The accuracy of the phase reconstruction by the present method is discussed.

  2. Dynamic Imaging of Electrochemical Reactions in All-Solid-State Li-Ion Batteries by Operando Scanning Transmission Electron Microscopy International conference

    K. Saitoh

    The 3rd Workshop of the Reaction Infography (R-ing) Unit  2020.12.11 

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    Event date： 2020.12

  3. Measuring Orbital Angular Momentum of Electron Beams Using Vortex Gratings Invited International conference

    齋藤　晃

    2020.11.12 

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    Event date： 2020.11

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

  4. Accurate Measurement of Electric Potential Distributions at the Interfaces in Solids Using Phase-shifting Electron Holography International conference

    T. Hirayama, S. Anada, Y. Nomura, H. Sasaki, K. Saitoh and K. Yamamoto

    Microscopy and Microanalysis 2020  2020.8.6  Microscopy Society of America

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    Event date： 2020.8

    Venue：Milwaukee，USA  

    DOI： 10.1017/S1431927620019935

  5. Performance of orbital-angularmomentum measurements using forked gratings International conference

    K. Saitoh, Y. Noguchi, W. Li, M. Uchida

    International Conference on Materials and Systems for Sustainability 2019   2019.11  ICMaSS2019, Nagoya University

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    Event date： 2019.11

    Presentation type：Poster presentation  

    Venue：Nagoya University, Nagoya, Japan  

  6. Observation of Manganese Nitride Thin Films by Electron Microscopy International conference

    T. Suzuta, Y. Kawasaki, K. Tanaka, T. Ishida, T. Hatano, H. Ikuta and K. Saitoh

    International Conference on Materials and Systems for Sustainability 2019   2019.11  ICMaSS2019, Nagoya University

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    Event date： 2019.11

    Presentation type：Poster presentation  

    Venue：Nagoya University, Nagoya, Japan   Country：Japan  

  7. How to Use Angular Fourier Transform for Orbital Angular Momentum Spectrum Mapping International conference

    W. Li, K. Saitoh and M. Uchida

    International Conference on Materials and Systems for Sustainability 2019   2019.11  ICMaSS2019, Nagoya University

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    Event date： 2019.11

    Presentation type：Poster presentation  

    Venue：Nagoya University, Nagoya, Japan   Country：Japan  

  8. Image Reconstruction of HighResolution STEM Image by Dictionary Learning and Evaluation of Atom Displacement International conference

    S. Hattori, Y. Nomura and K. Saitoh

    International Conference on Materials and Systems for Sustainability 2019   2019.11  ICMaSS2019, Nagoya University

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    Event date： 2019.11

    Presentation type：Poster presentation  

    Venue：Nagoya University, Nagoya, Japan   Country：Japan  

  9. Orbital angular momentum spectrum measured by forked gratings and its relation to angular Fourier transform International conference

    K. Saitoh

    Microscopy Conference 2019  2019.9 

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    Event date： 2019.8 - 2019.9

    Language：English   Presentation type：Poster presentation  

    Venue：Technische Universität Berlin, Berlin, Germany  

  10. Visualization of a Li-Ionic Space-Charge Layer in a Solid-Electrolyte by Transmission Electron Microscopy International conference

    Y. Nomura, K. Yamamoto, T. Hirayama, E. Igaki, K. Saitoh

    The 6th International Symposium on Advanced Microscopy and Theoretical Calculations  2019.6.14  Japan Fine Ceramics Cnter

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    Event date： 2019.6

    Venue：Nagoya, Japan  

  11. Analysing 3D distribution of nanoparticles by aberration-corrected TEM focal series

    J. Yamasaki, M. Kano, K. Saitoh, K. Yoshida, K. Kobayashi, and N. Tanaka

    The Fifth Conference on Frontiers of Aberration Corrected Electron Microscopy (PICO2019)  2019.5  Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons

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    Event date： 2019.5

    Venue：Kasteel Vaalsbroak, Netherlands  

  12. In situ STEM-EELS observation in an all-solid-state lithium-ion battery International conference

    Y. Nomura, K. Yamamoto, T. Hirayama, K. Saitoh

    19TH INTERNATIONAL MICROSCOPY CONGRESS 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Convention Centre, Sydney,Australia   Country：Australia  

  13. TEM-EELS of Photo-excited MWCNTs Using a Pulsed Electron Beam International conference

    K. Murayama,M. Kuwahara,T. Ishida,K. Saitoh

    19TH INTERNATIONAL MICROSCOPY CONGRESS 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Convention Centre, Sydney,Australia   Country：Australia  

  14. Magnetic structures in Nano-Fabricated Pt/Co/Ta Multilayer Film International conference

    K. Hamanaka,H. Suzuki,T. Ishida,M. Kuwahara,K. Saitoh,

    19TH INTERNATIONAL MICROSCOPY CONGRESS 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Convention Centre, Sydney,Australia   Country：Australia  

  15. Operando observation of electrode reactions in a solid oxide fuel cell by an environmental high-voltage electron microscope International conference

    T. Ishida,H. Hiroshima,K. Higuchi,T. Tanji,M. Tomita,K. Saitoh

    19TH INTERNATIONAL MICROSCOPY CONGRESS 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Convention Centre, Sydney,Australia   Country：Australia  

  16. Measuring the orbital angular momentum spectrum of electron beams using a Dammann vortex grating International conference

    Y. Noguchi,K. Saitoh,M. Uchida

    19TH INTERNATIONAL MICROSCOPY CONGRESS 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Convention Centre, Sydney,Australia   Country：Australia  

  17. In situ observation in an all-solid-state lithium-ion battery International conference

    Y. Nomura, K. Yamamoto, T. Hirayama, M. Ohkawa, E. Igaki, N. Hojo, K. Saitoh

    19TH INTERNATIONAL MICROSCOPY CONGRESS 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Convention Centre, Sydney,Australia   Country：Australia  

  18. Re-precipitation of Mg-Cd-Yb quasicrystals in Mg matrix and their interfaces Invited International conference

    S. Ohhashi, K. Saitoh, A. Kato, An Pang Tsai

    Aperiodic 2018 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Ames, Iowa, USA,   Country：United States  

  19. 収差補正TEMを用いた非整合エピタキシャル界面のラフネス計測

    鹿野正起，山﨑 順，齋藤 晃

    日本顕微鏡学会 第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  20. Pt/Co/Ta磁性多層膜試料の作製と電子顕微鏡学的評価 International conference

    濱中幸祐，鈴木潤士，石田高史，桑原真人，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  21. 辞書学習による原子分解能HAADF-STEM像のノイズ除去およびその定量性の評価

    服部颯介，野村優貴，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  22. リング状絞りを搭載した収差補正STEMによる焦点深度の拡大

    大脇健史，石田高史，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  23. 透過型電子顕微鏡によるSOI技術をもちいた積分型CMOSイメージセンサの性能評価

    篠崎 暉，石田高史，桑原真人，三好敏好，新井康夫，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  24. 実空間走査透過電子顕微鏡法をもちいた結晶中の電子伝播過程の観察

    鈴田朋也，石田高史，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  25. スピン偏極電子線をもちいた電子らせん波の生成

    冨樫将孝，桑原真人，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  26. TEM-EELSを用いた金八面体ナノ粒子の局在表面プラズモンの研究 International conference

    水野りら，桑原真人，石田高史，亀山達矢，佐藤健太郎，齋藤 晃，鳥本 司

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  27. カーボンナノチューブのTEM-EELSにおける光励起依存性の研究

    村山恒介，桑原真人，石田高史，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  28. 環境制御超高圧電子顕微鏡による固体酸化物形燃料電池の電極反応直接観察

    石田高史，廣嶋秀斗，樋口公孝，丹司敬義，富田正弘，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：English   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  29. 電子線ロッキングカーブの反復位相回復による積層欠陥の変位ベクトルの決定

    石塚宏幸，齋藤 晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  30. 機械学習による電子顕微鏡画像の圧縮センシング

    野村優貴, 山本和生, 平山 司, 齋藤晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  31. 2次元ダンマン渦回折格子をもちいた軌道角運動量測定 International conference

    齋藤 晃，野口雄紀，内田正哉

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  32. 辞書学習による電子顕微鏡画像の圧縮センシング

    野村優貴，山本和生，平山 司，齋藤　晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  33. 全固体リチウムイオン電池のオペランドSTEM-EELS観察

    野村優貴，山本和生，平山 司，齋藤　晃

    日本顕微鏡学会第74回学術講演会 

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    Event date： 2018.5

    Language：English   Presentation type：Oral presentation (general)  

    Venue：久留米シティプラザ   Country：Japan  

  34. Propagation properties of Electron Vortex Beams International conference

    K.Saitoh, Y.Hasegawa, H.Nambu, N.Tanaka, M.Uchida

    Microscopy and Microanalysis 2015 

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    Event date： 2015.8

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

    Country：United States  

  35. 電子らせん波の物理現象

    齋藤晃、内田正哉

    日本顕微鏡学会第71回学術講演会 

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    Event date： 2015.5

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

    Venue：京都   Country：Japan  

  36. ナノビーム電子回折法をもちいたGeSn/Ge微細構造の歪み分布解析

    齋藤晃、土井健太郎、池進一、中塚理、財満鎮明

    日本顕微鏡学会第71回学術講演会 

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    Event date： 2015.5

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

    Venue：京都   Country：Japan  

  37. HOLZ線のロッキングカーブプロファイルをもちいた3次元格子歪み解析II

    濱邊麻衣子，齋藤晃，森下茂幸，山崎順，田中信夫

    日本物理学会 第65回年次大会 

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    Event date： 2010.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  38. Strain mapping near Si/SiGe interfaces using HOLZ line CBED patterns International conference

    Joint Conference of the Asian Crystallographic Association and Chinese Crystallographic Society 

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    Event date： 2009.10

    Language：English   Presentation type：Oral presentation (general)  

    In the present study, we propose a simple method to determine the bending strain of a lattice together with lattice constants on the basis of the kinematical diffraction theory and the Hough transform technique. The method is applied to determine bending strains in a Si substrate region close to a Si/SiGe interface.

  39. MgB2のB-K殻励起をともなう電子線非弾性散乱の異方性の観察

    桃井 浩太、齋藤 晃、田中 信夫

    日本物理学2009年秋季大会 

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    Event date： 2009.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  40. HOLZ線のロッキングカーブプロファイルをもちいた3次元格子歪み分布解析

    濱邊麻衣子，齋藤晃，森下茂幸，山崎順，田中信夫

    日本物理学2009年秋季大会 

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    Event date： 2009.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  41. エネルギーフィルター電子回折をもちいた結晶構造および電子状態解析

    齋藤晃、村上大樹、永坂圭佑、田中信夫

    日本顕微鏡学会関西支部 平成21年度特別講演会 

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    Event date： 2009.8

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

    Country：Japan  

  42. Development of a Structure Determination Method of Quasicrystals by Convergent-Beam Electron Diffraction International conference

    The 5th Asian International Workshop on Quasicrystals 

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    Event date： 2009.6

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  43. 内殻励起非弾性散乱をもちいたMgB2の電子構造の異方性の研究

    齋藤晃、桃井浩太、田中信夫

    日本顕微鏡学会 第65回学術講演会 

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    Event date： 2009.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  44. 収差補正収束電子プローブをもちいた菊池バンドのプローブ位置依存性

    齋藤晃、多々良美秀、田中信夫

    日本顕微鏡学会 第65回学術講演会 

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    Event date： 2009.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  45. 収束電子回折法によるAl72Ni20Co8デカゴナル準結晶の構造精密化２

    村上大樹、齋藤晃、田中信夫、蔡安邦

    日本顕微鏡学会 第65回学術講演会 

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    Event date： 2009.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  46. CBED法をもちいた格子湾曲を含むSiGe/Si界面近傍の二次元格子歪み解析

    濱邊麻衣子，齋藤晃，田中信夫

    日本顕微鏡学会 第65回学術講演会 

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    Event date： 2009.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  47. 収束電子回折法によるAl72Ni20Co8デカゴナル準結晶の構造精密化IV

    村上大樹，齋藤晃，蔡安邦，田中信夫

    日本物理学会 第64回年次大会 

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    Event date： 2009.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  48. 収差補正収束電子プローブをもちいた菊池図形のプローブ位置依存性の観察

    日本物理学会 第64回年次大会 

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    Event date： 2009.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

    齋藤晃，多々良美秀，田中信夫

  49. HOLZ線図形の多点自動解析による二次元歪みマッピング

    濱邊麻衣子，齋藤晃，田中信夫

    日本物理学会 第64回年次大会 

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    Event date： 2009.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  50. Studies on atomic and electronic structures by energy-selected electron diffraction International conference

    Ultra-High Resolution TEM: Imaging and Diffraction 

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    Event date： 2008.12

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

  51. A method for the determination of a bending strain of a lattice by CBED International conference

    Development of Advanced Instruments for New Electron Microscopy and Diffraction 

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    Event date： 2008.9

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  52. Structure Refinement of a Decagonal Al72Ni20Co8 Quasicrystal by using Convergent-Beam Electron Diffraction International conference

    Development of Advanced Instruments for New Electron Microscopy and Diffraction 

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    Event date： 2008.9

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  53. Structure Refinement of a Decagonal Al72Ni20Co8 Quasicrystal by using Convergent-Beam Electron Diffraction International conference

    XXI Congress and General Assembly of the International Union of Crystallography 

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    Event date： 2008.8

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  54. Structure Refinement of a Decagonal Al72Ni20Co8 Quasicrystal by using Convergent-Beam Electron Diffraction International conference

    The 10th International Conference on Quasicrystals 

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    Event date： 2008.7

    Language：English   Presentation type：Poster presentation  

  55. Unique symmetry of Cd-based icosahedral quasicrystals revealed by convergent-beam electron diffraction International conference

    The 10th International Conference on Quasicrystals 

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    Event date： 2008.7

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

  56. Structure Refinement of a Decagonal Al72Ni20Co8 Quasicrystal by using Convergent-Beam Electron Diffraction International conference

    The 1st International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC 1) 

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    Event date： 2008.6

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  57. Automated Lattice-Parameter Determination by Using HOLZ Line Patterns International conference

    The 1st International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC 1) 

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    Event date： 2008.6

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  58. Observation of the Three-Dimentional q-Dependance of Inelastic Scattering Cross-Section of the K-shell Excitation of Graphite International conference

    The 1st International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC 1) 

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    Event date： 2008.6

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

  59. STEMトモグラフィによる金属担持酸化チタンの三次元構造解析

    吉田健太、末田省吾、平山司、苗蕾、齋藤晃、田中信夫

    日本顕微鏡学会第64回学術講演会 

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    Event date： 2008.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  60. 分裂したHOLZ線を含むCBED図形の解析による湾曲格子歪み計測法の研究

    齋藤 晃, 濱邊 麻衣子, 田中 信夫

    日本顕微鏡学会第64回学術講演会 

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    Event date： 2008.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  61. Bi系酸化物高温超伝導体のCu-L殻励起をともなう異方的非弾性散乱図形の観察

    齋藤 晃, 永坂 圭佑, 田中 信夫

    日本顕微鏡学会第64回学術講演会 

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    Event date： 2008.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  62. 収束電子回折法によるAl72Ni20Co8デカゴナル準結晶の構造精密化

    村上大樹, 齋藤 晃, 田中信夫, 蔡安邦

    日本顕微鏡学会第64回学術講演会 

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    Event date： 2008.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  63. 分裂したHOLZ線を含むCBED図形の解析による格子歪み計測法の研究

    齋藤 晃, 安田 佳史, 濱邊 麻衣子, 田中 信夫

    日本物理学会 第63回年次大会 

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    Event date： 2008.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  64. 酸化物高温超伝導体Bi2Sr2CaCu2O8のCu-L殻励起をともなう異方的非弾性散乱図形の観察

    永坂 圭佑, 齋藤 晃, 田中 信夫

    日本物理学会 第63回年次大会 

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    Event date： 2008.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

▼display all

To the head of Presentations.▲

Research Project for Joint Research, Competitive Funding, etc. 3

  1. 光電コヒーレント転写による光電子の波面制御の研究

    2019.11 - 2020.10

    第50回三菱財団自然科学研究助成 

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    Authorship：Principal investigator  Grant type：Other

    Grant amount：\5000000

  2. ナノメーター領域の半導体の格子歪みと電気伝導

    2007.4 - 2008.8

    財団法人 稲盛財団 

    　 More details

    Grant type：Competitive

  3. Defection of interstitial atoms by hollow-cone-beam high-angle annular dark-field scanning transmission electron microscopy

    2005.4 - 2007.3

    　 More details

    Grant type：Competitive

To the head of Research Project for Joint Research, Competitive Funding, etc..▲

KAKENHI (Grants-in-Aid for Scientific Research) 13

  1. 光電コヒーレント転写による電子線の波動関数制御の研究

    Grant number：22H03868  2022.4 - 2026.3

    科学研究費助成事業  基盤研究(B)

    齋藤 晃, 石田 高史

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    Authorship：Principal investigator 

    Grant amount：\18200000 （ Direct Cost: \14000000 、 Indirect Cost：\4200000 ）

    本研究では、空間中を伝播する電子の波動関数を自在に操る技術の構築を目指し、光から電子への状態転写を利用したまったく新しい電子波の波動関数制御の可能性を実験的に検証する。応募者のグループがこれまで開発してきたスピン偏極パルス透過電子顕微鏡は、電子源として負の電気親和性をもつ半導体フォトカソード型電子銃を搭載している。このフォトカソードに振幅および位相に構造をもつレーザー光を入射し、光から電子への状態転写を利用して振幅および位相に構造をもつ電子線を生成する。この技術を利用した「ZコントラストTEM法」、 「電子らせん波の生成」および「構造化照明電子顕微鏡法」などの新しい電子顕微鏡法の開発を目指す。

  2. 光電コヒーレント転写による電子線の波動関数制御の研究

    Grant number：23K25122  2022.4 - 2026.3

    科学研究費助成事業  基盤研究(B)

    齋藤 晃, 石田 高史

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    Authorship：Principal investigator 

    Grant amount：\18200000 （ Direct Cost: \14000000 、 Indirect Cost：\4200000 ）

    本研究は、振幅と位相に構造をもつ電子ビームの生成および構造化電子ビームをもちいた新しい顕微法の開発を目指し、理論的および実験的研究を行った。本研究により、1)半導体フォトカソードに照射するレーザー光の振幅の構造が放出される電子線に転写されることを実験的に確認した。2)世界で初めて構造化ビームをもちいた電子線近接場タイコグラフィーの開発に成功した。本手法は強度が極端に高い輝点を含む回折図形をもちいないこと、メソスケールの対象物に適用可能であること、電子線超分解能の可能性が期待されること、など従来のタイコグラフィーにないユニークな特徴があることが判明した。

  3. 表面電子顕微鏡法によるBa-Ti-O系準周期単層膜の構造解析

    Grant number：22H04590  2022.4 - 2024.3

    科学研究費助成事業  新学術領域研究(研究領域提案型)

    齋藤 晃

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    Authorship：Principal investigator 

    Grant amount：\8580000 （ Direct Cost: \6600000 、 Indirect Cost：\1980000 ）

    本研究では、原子分解能での走査電子顕微鏡（SEM）法をハイパーマテリアルに適用し、その表面構造の原子レベルでの解析を行う。まず、単原子および２次元原子層物質をもちいた系統的かつ定量的な解析をSEM像の解析を行い、原子分解能SEMの空間分解能およびコントラストの成因を明らかにする。それらの結果を踏まえ、世界で初めてBa-Ti-O系準周期単層膜の構造を原子レベルで明らかにする。また本研究を通じてSEMを原子分解能で表面構造解析ができる手法に進化させ、今後の表面科学研究のブレークスルーを図る。

  4. 自己組織化分子のスローダイナミクスが生み出す無機柔粘性結晶の開拓

    Grant number：20H02604  2020.4 - 2023.3

    科学研究費助成事業  基盤研究(B)

    片山 尚幸, 山内 徹, 齋藤 晃, 太田 幸則

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    Authorship：Coinvestigator(s) 

    本課題では申請者が二次元三角格子系LiVS2で最近見出した、柔粘性結晶相発現の背景物理の解明と、同様の性質を示す新たな物質系の開発を目指す。LiVS2は314 K以下でバナジウム三量体化を伴う金属-非磁性絶縁体転移を示す。高温常磁性相では、バナジウムがジグザグ状の短距離秩序を形成しており、このジグザグ鎖の形成パターンが時間・空間的にゆっくりと変動する。ジグザグ鎖のパターンは3種類存在し、これらの配向はすべて異なることから、この格子ダイナミクスは無機化合物で実現した柔粘性結晶状態と定義される。同様の『無機柔粘性結晶』の新たな候補物質の開発を通じて、その発現メカニズムを明らかにすることを目指す。
    低温で量体化転移を示す周辺物質の探索として、スピネル格子系LiRh2O4, βパイロクロア型CsW2O6という二物質に対する平均構造/局所構造解析を行った。前者においては、電荷秩序と二量体化が現れる低温相の結晶構造を明らかにし、この電荷秩序パターンが1950年代に理論提案されながらこれまでに実現例のなかった『アンダーソン条件』を満たす初めてのスピネル化合物であることを突き止めた。後者については、『3中心2電子結合』で形成された三角系型の三量体を持つ物質として知られているが、局所的にみると三量体が実現していないように見えることを明らかにした。おそらくは、三量体と思われたものが3通りの従来型二量体がガラス(液体)的に現れており、平均構造として電子不足型の三量体として捉えられたものと考えている。面白いことに、LiRh2O4, CsW2O6の両方に共通して、高温の常磁性相においては短距離秩序が発達していることを示唆する結果を得た。本研究のターゲットである量体化系で現れる無秩序分子が様々な物質系で普遍的に現れていることを示していると考えられる。
    また、本研究課題では、高温でジグザグ鎖のダイナミクスが現れるLiVS2に対する交流抵抗の周波数依存性からダイナミクスの定量測定を行うことを目指している。この実験には大型単結晶が必要となり、申請時には数年を要するものと見込んでいたが、初年度の研究で早くも達成することができた。合成は放射光を用いた単結晶XRD測定により確認している。これにより、得られた大型単結晶を用いて2021年度にダイナミクスの定量測定を行う予定である。
    本研究の課題である柔粘性結晶候補物質を複数見出すことに成功し、数年を要すると考えていたLiVS2大型単結晶の育成に一年で成功した。これにより、令和4年度に予定していた交流抵抗の周波数依存性実験を令和3年度に前倒しすることが可能となる。また、[研究実績の概要]には含めていないが、令和3年度に予定している幾つかの物質系の放射光回折実験を予備的におこなうことができた。これにより、令和3年度予定の実験の成功に向けた道筋が見えており、十分な下準備を始めることが出来ている。以上のような理由から、本研究課題は当初の計画以上に進展していると判断する。
    申請時の予定どおり、複数の三角格子系の化合物を対象として放射光を利用した回折実験やSTEM測定を行い、柔粘性結晶実現の可能性を探る。当初の予定にはなかった複数の物質系が候補として加わり始めており、次年度も当初の計画以上の進展が見込める点を強調したい。加えて、令和4年度に予定していた交流抵抗の周波数依存性実験を令和3年度に前倒しで進める予定である。

  5. 電子ビームの軌道角運動量測定法の開発およびその応用研究

    Grant number：18H01884  2018.4 - 2022.3

    科学研究費助成事業  基盤研究(B)

    内田 正哉, 齋藤 晃, 桑原 真人

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    Authorship：Coinvestigator(s) 

    本研究では、電子ビームの軌道角運動量測定法を開発し、その応用研究を行うことを目的に研究を遂行している。令和3年度の主な成果は、以下の通りである。
    <BR>
    昨年度に引き続き、新型コロナ流行による影響を大きく受け、研究の中断変更を余儀なくされた。非弾性散乱電子の軌道角運動量を検出するためには、これまでに作製し研究に利用してきた数ミクロンメートル大の「回折格子」よりもさらに小さい回折格子が必要であることが分かった。その加工には本学等が所有の液体ガリウム金属イオン源集束イオンビーム（FIB）では難しく、より微細な加工ができるヘリウムイオン顕微鏡装置が必要であった。当時、国内で稼働し利用できるヘリウムイオン顕微鏡装置は産業技術総合研究所（つくば市）所有の装置のみであった。産業技術総合研究所所有のヘリウムイオン顕微鏡の外部利用が可能となった年度後半時に、微細加工を行った。作製した回折格子を本学および名古屋大学の電子顕微鏡をもちいて評価を行った。軌道角運動量をもつ電子を生成する「フォーク型回折格子」として、われわれの知る限り、世界最小のもの（回折格子間隔約10nm）を作製することができた。しかしながら、非弾性散乱電子の検出には至っていない。回折パターン等を変え改良した「フォーク型回折格子」を新たに設計し、ヘリウムイオン顕微鏡による再加工をする予定である。また、昨年度に発案した電場型レンズ、位相板の設計を進め、試作をマイクロドリルをもちいた機械加工及びFIBにより行った。
    令和3年度が最終年度であるため、記入しない。
    令和3年度が最終年度であるため、記入しない。

  6. 量子もつれ状態にある2電子の生成および量子干渉現象に関する実験的検証

    2017.4 - 2021.3

    科学研究費補助金  基盤研究(A)

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    Authorship：Principal investigator 

  7. Experimental verification of the generation of quantum entanglement state of two electrons and the quantum interference phenomena

    Grant number：17H01072  2017.4 - 2021.3

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

    Saitoh Koh

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    Authorship：Principal investigator 

    Grant amount：\41730000 （ Direct Cost: \32100000 、 Indirect Cost：\9630000 ）

    We have developed an electron gun that generates structured electron beams having a specific amplitude and phase distribution by illuminating a semiconductor photocathode with structured light. An optical system that generates structured light with a specific intensity distribution was constructed using a spatial phase modulator and mounted on an electron microscope. It was confirmed that electron beams are generated by the structured light generated by the present optical system. We also conducted an intensity interference experiment using spin-polarized electrons, and found that electron beams with spin polarizations of ± 80% show anti-bunching phenomena which is not observed by electron beams with a spin polarization of 0%. In addition, we constructed a theory that describes the quantum interference effect and the breaking of Bell's inequality, and elucidated the mechanism by which weak values occur.

  8. Developing three-dimensional measurement method for nano- and atomistic structures using focal series of aberration-corrected transmission electron microscopy images

    Grant number：16K13688  2016.4 - 2018.3

    Yamasaki Jun

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    Authorship：Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    One of the imaging features in aberration-corrected transmission electron microscopy (AC-TEM) is that lattice fringe contrast is minimized at the in-focus condition. By utilizing the feature, we developed a new method to observe three-dimensional dispersion of metallic nano particles from a focal series of AC-TEM images. In the process, we developed a filtering procedure to display magnitude of lattice fringe contrast quantitatively. By using the filtering procedure, we also succeeded in developing a method to measure roughness at mismatch epitaxial interfaces between semiconducting materials.

  9. Atomic level and in-situ observation of battery-related materials by environmental high-voltage electron microscopy

    Grant number：26246006  2014.6 - 2018.3

    Tanaka Nobuo

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    Authorship：Coinvestigator(s) 

    In the present study, using an environmental high-voltage electron microscope, (1)lithium-related materials were studied under non-exposue-in-air conditions, (2)In-situ observations were performed with heating, applied voltages and various atomspheres in order to study degradation processes of the materials, and (3)various kinds of battery-related compounds were studied by STEM-electron energy loss spectroscopy for analysis of elemental distribution, and nano-probe electron diffraction mapping for study of local strain around interfaces of multi-layered structures.

  10. Establishment of Fundamental Engineering of Sn-related Group-IV Semiconductor Materials for Multi-Functional and Low-Power Electronics

    Grant number：26220605  2014.5 - 2019.3

    ZAIMA SHIGEAKI

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    Authorship：Coinvestigator(s) 

    We have investigated the thin-film growth and process technologies of Sn-related group-IV semiconductor such as germanium-tin and germanium-silicon-tin alloys for applications of tunnel field-effect transistor and multifunctional photoelectric device those will contribute to next generation electronics. We developed engineering technologies of thin films, interface properties, energy band structure, and electronic device process, and also established fundamental engineering and science of Sn-related group-IV alloy semiconductors contributing to the progress of low-power consumption transistors and multifunctional electronic and optoelectronic devices.

  11. Creation of an innovative beam control technology by operating upon electoron beam wavefunctions

    Grant number：26287066  2014.4 - 2019.3

    Uchida Masaya

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    Authorship：Coinvestigator(s) 

    The final target of this study was the creation of a new type of electron beams and an innovative beam control technology by operating the phase of electron beam　wavefunctions. In this study we generated an electron Bessel beam using a nanofabricated annular slit for the first time. We experimentally revealed the nonspreading and self-healing properties of the electron Bessel beam, which can be used for a new electron microscopy and an atomic manipulation technique. Our presented technique can be also used to generate a new type of electron beams.

  12. 電子らせんビームをもちいた磁気イメージングの研究

    2014.4 - 2017.3

    科学研究費補助金  基盤研究(B)

    齋藤晃

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    Authorship：Principal investigator 

  13. ナノメーター領域における半導体の格子歪みと電気伝導の精密測定

    2008.4 - 2011.3

    科学研究費補助金  基盤研究(B)・20360007

    齋藤　晃

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    Authorship：Principal investigator 

    STM探針を圧力印加プローブおよび電流計測プローブとしてもちい、また局所領域の歪み分布を収束電子回折をもちいて計測することにより、ナノメーター領域の歪みと電気伝導の関係を明らかにする。

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

Teaching Experience (On-campus) 14

  1. 計算機プログラミング

    2018

  2. 電磁気学III

    2018

  3. 電磁気学III

    2017

  4. 計算機プログラミング

    2017

  5. 電磁気学III

    2016

  6. 計算機プログラミング

    2016

  7. 電磁気学III

    2015

  8. 計算機プログラミング

    2015

  9. 解析力学及び演習

    2015

  10. First Year Seminar A

    2012

  11. 解析力学及び演習

    2012

  12. First Year Seminar A

    2011

  13. 結晶物性工学特論

    2011

  14. 解析力学及び演習

    2011

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

Social Contribution 3

  1. 日本物理学会市民科学講演会

    Role(s)：Presenter,　Planner,　Organizing member

    日本物理学会、日本物理学会名古屋支部、名古屋大学高等研究院  日本物理学会市民科学講演会  2021.3

  2. 研究成果・研究シーズのショートプレゼン（動画）

    Role(s)：Appearance

    テクノ・フェア　名大　2020  2020.10

  3. 日本顕微鏡学会市民公開講座

    Role(s)：Presenter,　Planner,　Organizing member

    日本顕微鏡学会  日本顕微鏡学会市民公開講座  2019.6

To the head of Social Contribution.▲

Academic Activities 5

  1. 日本顕微鏡学会顕微鏡計測インフォマティックス研究部会

    Role(s)：Planning, management, etc.,　Panel moderator, session chair, etc.

    齋藤晃  2021.1

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    Type：Academic society, research group, etc. 

  2. 日本顕微鏡学会顕微鏡計測インフォマティックス研究部会

    Role(s)：Planning, management, etc.,　Panel moderator, session chair, etc.

    齋藤晃  2020.1

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    Type：Academic society, research group, etc. 

  3. Microscopy編集委員

    Role(s)：Planning, management, etc.

    岡部繁男  2019.1

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    Type：Academic society, research group, etc. 

  4. 日本顕微鏡学会超分解能顕微鏡法分科会

    Role(s)：Planning, management, etc.,　Panel moderator, session chair, etc.

    齋藤晃  2021.2

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    Type：Academic society, research group, etc. 

  5. 日本物理学会名古屋支部長

    Role(s)：Planning, management, etc.

    齋藤晃  2018.4 - 2020.3

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    Type：Academic society, research group, etc. 

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