Updated on 2026/08/11

写真a

 
SUZUKI YUTA
 
Organization
School of Science Researcher
Title
Researcher
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Research Areas

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

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Education

  • The University of Tokyo   Graduate School of Science Doctoral Program   Department of Physics

    2021.4 - 2024.3

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    Country: Japan

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  • The University of Tokyo   Graduate School of Science   Department of Physics

    2019.4 - 2021.3

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    Country: Japan

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  • The University of Tokyo   Faculty of Science   Department of Physics

    2017.4 - 2019.3

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    Country: Japan

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Research History

  • RIKEN   Topological Phenomena Theory Research Team, Center for Emergent Matter Science   Visiting Scientist

    2026.4

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    Country:Japan

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  • The University of Tokyo   The Graduate School of Engineering

    2025.4

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    Country:Japan

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  • Institute of Science Tokyo

    2024.10

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    Country:Japan

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  • Tokyo Institute of Technology

    2024.4 - 2024.9

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    Country:Japan

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  • The University of Tokyo   Graduate School of Science

    2022.4 - 2024.3

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    Country:Japan

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  • The University of Tokyo

    2019.12 - 2024.3

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Professional Memberships

Papers

  • Chirality-dependent spin polarization in metals: linear and quadratic responses

    Kosuke Yoshimi, Yusuke Kato, Yuta Suzuki, Shuntaro Sumita, Takuro Sato, Hiroshi M. Yamamoto, Yoshihiko Togawa, Hiroaki Kusunose, Jun-ichiro Kishine

    Physical Review B   2026.4

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/95kq-fss8

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  • Disorder-Induced Slow Relaxation of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    Physical Review Letters   2025.7

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/z8wj-f384

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  • Spin relaxation, diffusion, and Edelstein effect in chiral metal surface

    Yuta Suzuki, Yusuke Kato

    Physical Review B   2023.3

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.107.115305

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  • Tunneling spin current in systems with spin degeneracy

    Yuta Suzuki

    Physical Review B   105 ( 7 )   2022.2

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/PhysRevB.105.075201

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MISC

  • Boundary condition for phonon distribution functions at a smooth crystal interface and interfacial angular momentum transfer

    Yuta Suzuki, Shuntaro Sumita, Yusuke Kato

    2026.1

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    We theoretically elucidate the boundary conditions for phonon distribution functions of long-wavelength acoustic phonons at smooth crystal interfaces. We first derive boundary conditions that fully incorporate reflection, transmission, and mode conversion. We obtain these conditions for phonons from those for classical lattice vibrations, using the correspondence between the quantum and classical descriptions. This formulation provides a theoretical foundation for the acoustic mismatch model, widely used to analyze Kapitza resistance. We then refine the boundary conditions to include spatial dependence parallel to the interface. The refined form captures transverse shifts of elastic wave packets, analogous to the optical Imbert--Fedorov shift, and ensures conservation of total angular momentum. Consequently, circularly polarized phonons carrying spin angular momentum (SAM) generate phonon orbital angular momentum (OAM) at the interface. We analytically determine the spatial profile of this OAM and demonstrate that SAM and OAM are both involved in the interfacial diffusion of chiral phonons. Our theory provides concise boundary conditions for phonons, with applications ranging from heat transport to phonon angular momentum transport.

    arXiv

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    Other Link: https://arxiv.org/pdf/2601.18584v1

  • Theory of phonon angular momentum transport across a smooth crystal interface

    Yuta Suzuki, Shuntaro Sumita, Yusuke Kato

    2024.9

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    We theoretically elucidate the transfer of phonon angular momentum by acoustic modes across a smooth interface between crystals. We analyze this process, which is difficult to describe with the conventional acoustic mismatch model, using a reformulated boundary condition and the Boltzmann theory. For an interface between a chiral and an achiral crystal, our analysis reveals that thermal gradients in the chiral crystal induce angular momentum, which diffuses into the achiral crystal even without heat flow. Notably, the density of angular momentum can be enhanced near the interface. These findings advance our understanding of phonon transport and its interplay with electron spins.

    arXiv

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    Other Link: https://arxiv.org/pdf/2409.08874v3

Presentations

  • フォノンのスピン・軌道角運動量とカイラル結晶からの拡散 Invited

    鈴木裕太

    若手カイラリティ研究会  2026.8 

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    Event date: 2026.8

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

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  • Theory of phonon angular momentum transport across smooth interfaces between crystals

    鈴木裕太

    学術変⾰領域研究(A)「キメラ準粒⼦が切り拓く新物性科学」領域会議  2026.5 

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    Event date: 2026.5

    Language:Japanese   Presentation type:Poster presentation  

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  • Quantum kinetic theory of electric polarization in inhomogeneous crystals

    Yuta Suzuki, Nobuhiro Arai, Manato Fujimoto, Yang Gao, Di Xiao, Shuichi Murakami

    The Physical Society of Japan, 2026 Spring Meeting  2026.3 

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    Event date: 2026.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Disorder-Induced Slow Relaxation of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    APS Global Physics Summit 2026  2026.3 

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    Event date: 2026.3

    Language:English   Presentation type:Oral presentation (general)  

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  • Dyakonov-Perel-like Relaxation Mechanism of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    Iwate Spintronics School, 2026 Winter  2026.3 

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    Event date: 2026.3

    Language:English   Presentation type:Oral presentation (general)  

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  • フォノンのスピン・軌道角運動量:カイラル結晶から界面への拡散と透過 Invited

    鈴木裕太

    カイラル物質と量子輸送に関する理論研究会  2026.2 

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    Event date: 2026.2

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

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  • フォノン偏極の遅い緩和現象の理論的予言

    鈴木裕太, 村上修一

    キメラ準粒子・分野融合研究会 ~スピン×音響×光×軌道~  2025.12 

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    Event date: 2025.12

    Language:Japanese   Presentation type:Poster presentation  

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  • フォノン偏極の遅い緩和現象の理論的予言

    鈴木裕太, 村上修一

    第19回物性科学領域横断研究会  2025.11 

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    Event date: 2025.11

    Language:English   Presentation type:Poster presentation  

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  • Dyakonov-Perel-like Relaxation Mechanism of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    The Physical Society of Japan, 2025 Annual Meeting  2025.9 

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    Event date: 2025.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Disorder-Induced Slow Relaxation of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    30th International Conference on Low Temperature Physics (LT30)  2025.8 

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    Event date: 2025.8

    Language:English   Presentation type:Poster presentation  

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  • Disorder-Induced Slow Relaxation of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    SPICE Workshop Chiral Phonons  2025.7 

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    Event date: 2025.7

    Language:English   Presentation type:Poster presentation  

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  • Theory of phonon angular momentum transport across smooth interfaces between crystals

    Yuta Suzuki, Shuntaro Sumita, Yusuke Kato

    Chirality in Condensed Matter Physics (CCMP2025)  2025.6 

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    Event date: 2025.6

    Language:English   Presentation type:Poster presentation  

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  • Disorder-induced slow relaxation of phonon polarization

    Yuta Suzuki, Shuichi Murakami

    Chirality in Condensed Matter Physics (CCMP2025)  2025.6 

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    Event date: 2025.6

    Language:English   Presentation type:Poster presentation  

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  • Disorder-Induced Slow Relaxation of Phonon Polarization

    2025.5 

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    Event date: 2025.5

    Language:English   Presentation type:Poster presentation  

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  • Disorder-Induced Slow Relaxation of Phonon Polarization

    Yuta Suzuki, Shuichi Murakami

    CEMS Symposium on Emergent Quantum Materials 2025  2025.5 

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    Event date: 2025.5

    Language:English   Presentation type:Poster presentation  

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  • Theory of phonon angular momentum transport across smooth interfaces between crystals

    Yuta Suzuki, Shuntaro Sumita, Yusuke Kato

    APS Global Physics Summit 2025  2025.3 

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    Event date: 2025.3

    Language:English   Presentation type:Oral presentation (general)  

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  • フォノン角運動量のダイナミクス:界面輸送と緩和機構 Invited

    鈴木裕太

    分子研研究会 キラリティが関連する動的現象  2025.3 

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    Event date: 2025.3

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

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  • Spin Edelstein effect at interfaces between metals

    Yuta Suzuki, Yusuke Kato

    KiPAS International Workshop on Recent Advances in Orbitronics and Spintronics  2024.11 

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    Event date: 2024.11

    Language:English   Presentation type:Poster presentation  

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  • Interfacial transmission of phonon angular momentum II

    Yuta Suzuki, Shuntaro Sumita, Yusuke Kato

    The Physical Society of Japan, 2024 Annual Meeting  2024.9 

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • カイラルな金属でのスピン輸送と電流スピン流変換 Invited

    鈴木裕太

    キラル若手の会, 金沢  2024.7 

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    Event date: 2024.7

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

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  • Tunneling spin current in systems with spin degeneracy

    Yuta Suzuki

    International Workshop on Transport and Optics in Topological Systems (TOTS 2024)  2024.6 

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    Event date: 2024.6

    Language:English   Presentation type:Poster presentation  

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  • Interfacial transmission of phonon angular momentum

    Yuta Suzuki, Shuntaro Sumita, Yusuke Kato

    The Physical Society of Japan, 2023 Annual Meeting  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Spin Relaxation, Diffusion and Edelstein Effect in Chiral Metal Surface Invited

    Yuta Suzuki, Yusuke Kato

    13th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META 2023)  2023.7 

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    Event date: 2023.7

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

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  • 量子輸送方程式によるカイラル金属バルクでのスピン輸送の記述

    鈴木裕太, 加藤雄介

    日本物理学会2023年春季大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Edelstein effect and its reciprocity at chiral metal interface

    Yuta Suzuki, Yusuke Kato

    APS March Meeting 2023  2023.3 

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (general)  

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  • カイラル金属表面でのスピン輸送と電流スピン流変換

    鈴木裕太, 加藤雄介

    ISSPワークショップ カイラル物質科学の新展開  2022.12 

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    Event date: 2022.12

    Language:English   Presentation type:Poster presentation  

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  • Spin Relaxation, Diffusion and Edelstein Effect in Chiral Metal Surface

    Yuta Suzuki, Yusuke Kato

    Novel Quantum States in Condensed Matter 2022  2022.11 

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    Event date: 2022.10 - 2022.12

    Language:English   Presentation type:Poster presentation  

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  • カイラル金属界面でのスピン輸送現象

    鈴木裕太, 加藤雄介

    日本物理学会2022年秋季大会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Spin Polarization, Spin Diffusion, and Spin-Charge Conversion in Chiral Metals

    Yuta Suzuki, Yusuke Kato

    29th International Conference on Low Temperature Physics (LT29)  2022.8 

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    Event date: 2022.8

    Language:English   Presentation type:Poster presentation  

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  • Tunneling Spin Current in a System with Spin Degeneracy

    Yuta Suzuki

    Joint International Conference: EP2DS-24 and MSS-20  2021.11 

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    Event date: 2021.10 - 2021.11

    Language:English   Presentation type:Poster presentation  

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  • 時間反転対称かつ空間反転対称な系におけるトンネルスピン流

    鈴木裕太

    日本物理学会第76回年次大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スピン縮退した2バンド系からのトンネルスピン流

    鈴木裕太

    京都大学基礎物理学研究所 セミナー  2021.9 

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    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • Tunneling spin current in systems with spin degeneracy: Insights from geometric correction

    Yuta Suzuki

    Seminar at ETH Zürich  2023.7 

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    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • Tunneling spin current in systems with spin degeneracy: Insights from geometric correction

    Yuta Suzuki

    CMT/LTC Seminars, Paul Scherrer Institute  2023.7 

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    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • Dynamics of phonon angular momentum: Mechanisms of interfacial transport and relaxation

    Yuta Suzuki

    Quantum Theory of Materials Seminar, Forschungszentrum Jülich  2025.7 

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    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • Tunneling spin current in systems with spin degeneracy

    Yuta Suzuki

    Seminar at Academia Sinica  2024.6 

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    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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Awards

  • Best Poster Award

    2025.8   30th International Conference on Low Temperature Physics   Disorder-Induced Slow Relaxation of Phonon Polarization

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  • 学生優秀発表賞(領域4)

    2022.9   日本物理学会   カイラル金属界面でのスピン輸送現象

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  • Best Poster Award

    2022.8   29th International Conference on Low Temperature Physics   Spin Polarization, Spin Diffusion, and Spin-Charge Conversion in Chiral Metals

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Research Projects

  • カイラルな物質における動的なスピン偏極現象の理論研究

    Grant number:24KJ1036  2024.4 - 2027.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    鈴木 裕太

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

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  • カイラリティの誘起する新奇なスピン輸送現象の解明

    Grant number:22KJ0856  2023.3 - 2024.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    鈴木 裕太

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    Grant amount:\1700000 ( Direct Cost: \1700000 )

    電子のもつスピン角運動量の固体中での拡散・生成は盛んに研究されており、その対象は元の形とその鏡像が重なり合わないカイラルな立体構造をもつ物質にまで広がりをみせている。特に、一部のカイラルな金属において、局所的な電流によって長距離にわたりスピン偏極の生じる非局所応答が見つかり、その機構に関心が集まっている。そこで、このようなマクロスケールでのスピン拡散現象、およびその検出に利用された界面でのスピン電荷変換の両者を扱うことのできる理論的枠組みが望まれていた。
    本研究では、緩和時間近似を超えたボルツマン方程式の立場から同現象の定式化を進めた。昨年度までに、固体電子のスピン自由度と運動量自由度との結合項(スピン軌道結合)の表式がカイラルな結晶と類似した2次元模型に対して次の(A)・(B)の成果を得た。
    (A) 平衡状態への緩和・拡散の解析:ボルツマン方程式の衝突積分からスピン輸送に関わる遅い減衰モードを取り出し、強いスピン軌道結合下でも有効なスピン緩和時間・スピン拡散長の定義を与えることに成功した。
    (B) 界面での電流とスピンの間の相互変換(エーデルシュタイン効果)の解析:非磁性金属との接合界面におけるスピン輸送を境界条件のもと解析的に記述し、界面でのエーデルシュタイン効果に対するオンサーガーの相反定理を初めて明らかにした。
    本年度は前年度に引き続き、カイラルな金属内部および界面におけるスピン輸送現象の理論研究を行った。特に研究成果の発表に力を入れ、国際会議における招待講演を行った。また当初の計画以上に進展した内容として、電子スピンの界面輸送の類推である、フォノン角運動量の界面輸送の研究にも着手できた。
    本研究の成果は、その手法により非一様・非定常な系のスピン緩和時間・拡散長が簡潔に記述できる利点がある上、スピン電荷変換の効率を上げる設計指針・実験解析に応用できる点で意義深い。

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