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J-GLOBAL ID：201201058045722076 Update date: Dec. 13, 2024

Ryota Akiyama

アキヤマリョウタ | Ryota Akiyama

Affiliation and department：
Job title： Assistant Professor
Other affiliations (1)：

Japan Science and Technology Agency PRESTO Individual Researcher

Research field (4)： Thin-film surfaces and interfaces , Electronic devices and equipment , Magnetism, superconductivity, and strongly correlated systems , Nanostructure physics

Research keywords (12)： semiconductor , ultra high vacuum , Molecular beam epitaxy , topological insulator , graphene , low-dimensional materials , Surface science , Neutron scattering , Angle resolved photoemission spectroscopy , Scanning tunnel microscopy , Spintronics , Magnetism

Research theme for competitive and other funds (23)：

2024 - 2027 Novel Spin Devices Fabricated by High-Quality Ultra-Flat Thin Films of Topological Crystal Insulators
2024 - 2027 Strong Correlation Physics in Graphene Pioneered by Intercalation of Rare Earth Atoms
2023 - 2026 強磁場サイクロトロン共鳴によるBiSbトポロジカル表面状態の検出
2023 - 2026 Detection of BiSb topological surface states by high magnetic field cyclotron resonance
2022 - 2026 Pioneering high Curie/Néel temperature atomic layer magnets and high temperature quantum anomalous Hall effect

2022 - 2025 Control of spin-orbit torque in topological crystalline insulator (Pb,Sn)Te and its application

2020 - 2025 Control of single spin state by lattice strain and phonon-mediated spin-spin interaction

2023 - 2025 Realization of Higher Transition Temperature of Interfacial Superconductivity by Addition of Light Elements

2023 - Development of High-Quality Topological Insulator Thin Films and Their Application to Next-Generation High-Speed Operating Spin Devices

2020 - 2023 Non-Reciprocal Transport at Surface Edges of Strong Spin-Orbit Interaction Materials

2020 - 2023 Elucidation of interface magnetism in topological insulator/ferromagnetic material and development for high-temperature quantum anomalous Hall effect

2018 - 2022 Novel magnetic properties of two-dimensional ferromagnetic van der Waals atomic layers

2018 - 2021 External modulation and application of topological states in topological crystal insulators

2018 - 2020 High temperature atomic layer superconductivity realized with hydrogenation

2016 - 2019 Detection of Meissner effect of surface-superstructure superconductivity by UHV-SQUID

2013 - 2018 Study of Electron/Spin Transport at Molecules by Functionalized Four-Tip STM

2016 - 2018 Development of monolayer topological insulators and exploration of concert effects in superconductive interfaces

2014 - 2016 Development and investigation of a ferromagnetic topological crystalline insulator with focusing on space inversion symmetry

2013 - 2016 Studies on Electronic and Spin Transport at Topological Surfaces and Edge States

2013 - 2014 Development of Novel Topological Insulator Spin-Polarized Materials for Realization of High-Speed Spin Devices

2012 - 2014 Elucidation and control of the mechanism of magnetism in magnetic semiconductors with the high Curie temperature

2010 - 2011 Formation of highly spin-polarized materials and nanostructures and study of spin-dependent transport phenomena

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Papers (35)：

Yukihiro Endo, Ryota Akiyama, Rei hobara, Shuji Hasegawa. SiC基板上のグラフェンへのインターカレーション過程での積層構造変化. Materia Japan (The Japan Institute of Metals). 2024. 63. 12. 829
Ibuki Taniuchi, Ryota Akiyama, Rei Hobara, Shuji Hasegawa. Surface Circular Photogalvanic Effect in Tl-Pb Monolayer Alloys on Si(111) with Giant Rashba Splitting. ACS nano. 2024
Kobayashi, Takahiro, Toichi, Yuichiro, Yaji, Koichiro, Nakata, Yoshitaka, Yaoita, Yuchi, Iwaoka, Mutsuki, Koga, Mariko, Zhang, Yituo, Fujii, Jun, Ono, Shimpei, et al. Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal. Nano Letters. 2023. 23. 16. 7675-7682
Yukihiro Endo, Xue Yan, Meng Li, Ryota Akiyama, Christian Brandl, Jefferson Zhe Liu, Rei Hobara, Shuji Hasegawa, Weishi Wan, K. S. Novoselov, et al. Dynamic topological domain walls driven by lithium intercalation in graphene. Nature Nanotechnology. 2023. 18. 10
Ryota Akiyama, Takuya Takashiro, Shinji Kuroda, Shuji Hasegawa. Concerted effects of topological insulators and ferromagnetism. Vacuum and Surface Science. 2023. 66. 1

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MISC (99)：

佐藤瞬亮, 秋山了太, JEHONG J., 宮井雄大, KUMAR Yogendra, KUMAR Amit, 皆川遼太朗, 出田真一郎, 島田賢也, 長谷川修司. Emergence of superconductivity in Yb-intercalated epitaxial graphene and its atomic/electronic structures. 日本物理学会講演概要集(CD-ROM). 2024. 79. 1
谷内息吹, 秋山了太, 保原麗, 長谷川修司. Helicity-dependent photocurrent induced by circularly polarized infrared at atomic layer superstructure (Tl,Sn)/Si(111). 日本物理学会講演概要集(CD-ROM). 2023. 78. 2
佐藤瞬亮, 秋山了太, 皆川遼太朗, 宮井雄大, KUMAR Yogendra, KUMAR Amit, JUNG J., 出田真一郎, 島田賢也, 長谷川修司. Electronic structure and electronic transport properties of Yb-intercalated epitaxial graphene. 日本物理学会講演概要集(CD-ROM). 2023. 78. 2
皆川遼太朗, 秋山了太, 郭宇嘯, 長谷川修司. Magnetism and electrical transport properties of heterostructures with topological crystalline insulator Pb_xSn_1-xTe and magnetic layer Cr_x(Bi_1-ySb_y)_2-xTe₃. 日本物理学会講演概要集(CD-ROM). 2023. 78. 2
清水翔太, 秋山了太, 保原麗, 長谷川修司. Effect on superconducting transition temperature of topological superconductor Fe(Se,Te) modified with light elements. 日本物理学会講演概要集(CD-ROM). 2023. 78. 2

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Patents (3)：

岩塩型構造を持つ化合物の単結晶薄膜及びその製造方法
Single crystal thin films of alloys having a NaCl structure and their fabrication methods
磁気トンネル接合素子及び磁気メモリ

Books (5)：

東京大学理学部ニュース研究最前線「Ca原子を挿入したグラフェンで新奇な超伝導」
東京大学理学部 2022
室温強磁性トポロジカル磁性絶縁体MnTe/(Bi,Sb)2Te3における量子異常ホール効果観測にむけて
低温センター年報 Annual report 2018 研究ノート, p.11-15 2019
トポロジカル結晶絶縁体SnTeとFeヘテロ界面における強磁性proximity効果の検証
CROSS季刊誌「四季」p6-7, Vo.39 2018
Magnetic and transport properties of Mn-doped magnetic semiconductors: Influence of structural homogeneity and inhomogeneity
2012
工作ニュース「工作部門を利用して」

Lectures and oral presentations (8)：

中性子散乱とμSRを用いたβ”-LiFeO2における磁性観測:短距離スピン相関と超常磁性的性質
(KEK連携研究会「トポロジカル絶縁体・スピントロニクスとその周辺の話題」 2013)
MBEにより成長した磁性半導体(Zn,Fe)Teの構造と磁性
(PASPS-17 2012)
Magnetic and transport properties of Group-IV based ferromagnetic semiconductor Ge1-xFex with Boron doping
(2012 International Conference on Solid State Devices and Materials 2012)
Ge(111)基板上に成長したGe1-xMnxにおける構造と磁性: Mn濃度依存性
(Mn doping concentration dependence of the structure and magnetism in Ge1-xMnx grown on Ge(111) substrate 2012)
Transport and magnetic properties of Boron-doped group-IV based ferromagnetic semiconductor Ge1-xFex
(第73回応用物理学会学術講演会 2012)

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Education (2)：

2009 - 2012 The University of Tokyo The Graduate School of Engineering Department of Electrical Engineering and Information Systems
2007 - 2009 The University of Tokyo The Graduate School of Engineering Department of Applied Physics

Professional career (1)：

Ph.D (The University of Tokyo)

Work history (6)：

2014/12 - 現在 The University of Tokyo Department of Physics, Faculty of Science Assistant Professor
2024/10 - 2028/03 PRESTO Individual Researcher
2021/05 - 2023/03 National Institute for Materials Science Center for Magnetism and Spintronics Research Materials Visiting Researcher
2014/12 - 2015/12 University of Tsukuba Faculty of Pure and Applied Sciences Guest researcher
2012/04 - 2014/12 University of Tsukuba Graduate School of Pure and Applied Sciences Assistant Professor

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Committee career (4)：

2024/04 - 現在 The Japan Society of Vacuum and Surface Science Kanto Branch Officers
2024 - 現在 Springer Nature Discover Nano Editorial Board
2015/06 - 2019/05 The Magnetics Society of Japan planning committee member
2017/10 - 2018/10 The Physical Society of Japan Area 4 Steering Committee

Awards (4)：

2023/12 - The Japan Society of Applied Physics The Japan Society of Applied Physics, Thin Film and Surface Physics Section Paper Award Soft Magnetic Skyrmions Induced by Surface State Coupling in an Intrinsic Ferromagnetic Topological Insulator Sandwich Structure Intrinsic Ferromagnetic Topological Insulator Sandwich Structure
2023/04 - UBE Foundation for the Promotion of Science 63th Academic Encouragement Award
2023/01 - 2022 Annual Meeting of the Japan Society of Vacuum and Surface Science Presentation Award (Young Researcher Category) Growth of atomically flat SnTe(001) thin films using the room temperature wetting layer method and its electrical transport measurements
2010 - Cryogenic Research Center, The University of Tokyo Best Presentation Award at the 1st Report Meeting of the Cryogenic Research Center in The University of Tokyo

Association Membership(s) (5)：

THE MAGNETICS SOCIETY OF JAPAN , THE PHYSICAL SOCIETY OF JAPAN , The Japan Society of Applied Physics , American Physical Society , The Japan Society of Vacuum and Surface Science

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