Details of the Researcher

PHOTO

Takuto Soma
Section
Institute of Multidisciplinary Research for Advanced Materials
Job title
Senior Assistant Professor
Degree

  • Ph.D. (Eng.) (Tokyo Institute of Technology)

Profile

Takuto Soma currently works at Kumigashira group in the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University as an senior assistant professor. His research focuses on exploring the exotic properties of transition-metal oxides and their device application. Recently, he has been working on projects related to the materials discovery and design of various inorganic solid materials containing nitrides.

Research History 4

  • 2025/10 - Present
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials　Senior Assistant Professor

  • 2024/10 - 2025/09
    Institute of Science Tokyo　Department of Chemical Science and Engineering, School of Materials and Chemical Technology　Assistant professor

  • 2019/10 - 2024/09
    Tokyo Institute of Technology　Department of Chemical Science and Engineering, School of Materials and Chemical Technology　Assistant Professor

  • 2018/04 - 2019/09
    Japan Society for the Promotion of Science　Research Fellowship for Young Scientists

Education 5

  • Tokyo Institute of technology　Department of Chemical Science and Engineering　Doctral Course

    2017/04 - 2019/09

  • Tokyo Institute of technology　Graduate School of Science and Engineering　Department of Applied Chemistry Master's Course

    2015/04 - 2017/03

  • Tokyo Institute of technology　Faculty of Engineering　Department of Chemical Engineering

    2011/04 - 2015/03

  • Fudooka high school

    2007/04 - 2010/03

  • Ph.D. (Eng., Tokyo Institute of Technology)

    2024/07 -

Professional Memberships 3

  • Materials Research Society

  • THE PHYSICAL SOCIETY OF JAPAN

  • THE JAPAN SOCIETY OF APPLIED PHYSICS

Research Interests 6

  • Superconductivity

  • Solid-state chemistry

  • Epitaxial thin films

  • Strongly correlated electron systems

  • Transition metal compounds

  • Oxide electronics

Research Areas 3

  • Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

  • Nanotechnology/Materials / Thin-film surfaces and interfaces /

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment /

Awards 8

  1. 令和7年度 手島精一記念研究賞 博士論文賞

    2026/03　東京科学大学

  2. Science Tokyo Challenging Research Award

    2025/09　Institute of Science Tokyo　High-throughput exploration of multinary nitride materials

  3. 14th JSAP Superconductors Division Paper Award

    2023/03　JSAP Superconductors Division　p-type transparent superconductivity in a layered oxide

  4. The 65th JSAP Spring Meeting Poster Award

    2018/03　THE JAPAN SOCIETY OF APPLIED PHYSICS　"Impact of hole-doping on metal-insulator transition in β-pyrochlore-type CsW2O6"

  5. 7th CSJ Chemistry Festa Poster Award

    2017/10　THE JAPAN SOCIETY OF CHEMISTRY　"Reversible control of electronic phases for tungsten oxides by electrochemical intercalation"

  6. Young Scientist Presentation Award

    2017/09　THE JAPAN SOCIETY OF APPLIED PHYSICS　"Epitaxial growth and physical properties of β-pyrochlore-type CsW2O6 films"

  7. Poster Award

    2017/08　The 10th International Conference on the Science and Technology for Advanced Ceramics　"Electrochemical modulation of electronic states for tungsten oxide epitaxial films"

  8. Graduation thesis presentation oukakai excellence award

    2015/03　Tokyo Institute of Technology　Control of physical properties in WO3 epitaxial films by electrochemical Li insertion

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Papers 22

  1. Stoichiometric CuFeO2 Thin Films Synthesized by Pulsed-Laser Deposition Using an Oxidized Target with Cu(II) Ions

    Yuki Kinoshita, Takuto Soma, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    Crystal Growth & Design　2026/08/10

    DOI： 10.1021/acs.cgd.6c00085 　

  2. Alternating-Target Pulsed-Laser Deposition for Tuning Anion Composition of ZrNxHy Epitaxial Thin Films

    Daichi Miyazaki, Takuto Soma, Akira Ohtomo

    Crystal Growth & Design　2026/07/15

    DOI： 10.1021/acs.cgd.6c00252 　

  3. Lattice-matched (Al x Sc y Ga1− x − y )2O3/ β -Ga2O3 heterostructures with widely tunable bandgap

    Kazuki Koreishi, Kodai Niitsu, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    Applied Physics Letters　129　(1)　2026/07/06

    Publisher: AIP Publishing

    DOI： 10.1063/5.0326523 　

    ISSN： 0003-6951

    eISSN： 1077-3118

    More details Close

    Bandgap engineering of β-Ga2O3 is essential for advancing its electronic and optoelectronic applications. However, the growth of high-quality heteroepitaxial structures is often hampered by large lattice mismatches. In this study, we design (AlxScyGa1−x−y)2O3 quaternary alloys in the form of both polycrystalline powders and heteroepitaxial films and demonstrate their lattice matching to β-Ga2O3. Powder x-ray diffraction (XRD) measurements reveal that the lattice parameters of monoclinic (AlxScyGa0.8)2O3 match those of β-Ga2O3 when x/y = 1.5–3.2. (AlxScyGa1−x−y)2O3 thin films are grown on β-Ga2O3 (100) substrates by pulsed-laser deposition by varying the composition ratio x/y and the total substitutional fraction x + y. Nearly perfect lattice-matched epilayers with uniform composition and crystal structure are obtained up to x + y ∼ 0.6, as confirmed by XRD and scanning transmission electron microscopy. Electron energy loss spectroscopy reveals a tunable bandgap from 4.5 to 5.8 eV. These results demonstrate that (AlxScyGa1−x−y)2O3/β-Ga2O3 heterostructures are promising platforms for ultrawide-bandgap semiconductor devices.

  4. Topochemical Synthesis and Photocatalytic Activity of Layered K2LaTa2O6N Using CsLaTa2O7 Precursor Prepared by Flux Method

    Hideya Tsuchikado, Yuki Kinoshita, Masashi Hattori, Megumi Okazaki, Takuto Soma, Fumitaka Ishiwari, Michikazu Hara, Akinori Saeki, Kazuhiko Maeda

    Inorganic Chemistry　2025/11/25

    DOI： 10.1021/acs.inorgchem.5c04858 　

  5. Strongly Correlated van der Waals Oxide: 2H-NbO2 International-journal Peer-reviewed

    Aya Sato, Takuto Soma, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    ACS Nano　19　(29)　26592-26599　2025/07/18

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsnano.5c05513 　

    ISSN： 1936-0851

    eISSN： 1936-086X

  6. Structural and electrical properties of (100) β-(ScxGa1−x)2O3/Ga2O3 heterojunctions

    Kazuki Koreishi, Takuto Soma, Akira Ohtomo

    Journal of Applied Physics　2025/07/07

    DOI： 10.1063/5.0277701 　

  7. Superconducting Dome and Quantum Criticality in Two-Dimensional NbO2 Triangular Lattice

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    arXiv　2025/05

    DOI： 10.48550/arXiv.2505.07241 　

  8. Effects of Metal-Cation Doping on Photocatalytic H2 Evolution Activity of Layered Perovskite Oxynitride K2LaTa2O6N

    Hideya Tsuchikado, Shuji Anabuki, Ovidiu Cretu, Yuki Kinoshita, Masashi Hattori, Yuta Shiroma, Dongxiao Fan, Megumi Okazaki, Takuto Soma, Fumitaka Ishiwari, Shunsuke Nozawa, Toshiyuki Yokoi, Michikazu Hara, Koji Kimoto, Akira Yamakata, Akinori Saeki, Kazuhiko Maeda

    ACS Applied Energy Materials　2025/03/11

    DOI： 10.1021/acsaem.4c03131 　

  9. Strain-induced band-gap widening in (100) β−Ga2O3 thin films grown on θ−Al2O3 buffer layers

    Kazuki Koreishi, Takeyoshi Onuma, Takuto Soma, Akira Ohtomo

    Physical Review Materials　2025/03/10

    DOI： 10.1103/PhysRevMaterials.9.L031601 　

  10. Epitaxial growth and band offsets of β -(ScxGa1− x)2O3 thin films grown on (100) β -Ga2O3 substrate

    Kazuki Koreishi, Takuto Soma, Hiroshi Kumigashira, Akira Ohtomo

    Applied Physics Letters　2024/10/07

    DOI： 10.1063/5.0226675 　

  11. Modulation of magnetic property of double-perovskite La2MnCoO6 films by controlling B-antisite disorder

    Ramchandra Sahoo, Shutong Zhang, Yu Takeuchi, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Osami Sakata, Takuto Soma, Akira Ohtomo

    arXiv　2208.09166　2022/08/19

    DOI： 10.48550/arXiv.2208.09166 　

  12. Electrochemical modulation of electronic states in strongly correlated transition-metal oxides Invited

    Akira Ohtomo, Takuto Soma, Kohei Yoshimatsu

    JSAP Review　2022　220202　2022/08

    DOI： 10.11470/jsaprev.220202 　

  13. Epitaxial growth of MoO3 polymorphs and impacts of Li-ion electrochemical reactions on their structural and electronic properties

    Shuxin Zhang, Tatsuya Yajima, Takuto Soma, Akira Ohtomo

    Applied Physics Express　2022/05/01

    Publisher: {IOP} Publishing

    DOI： 10.35848/1882-0786/ac6aae 　

  14. Two-dimensional superconductivity in single-band correlated 2H-type NbO2 layers Peer-reviewed

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    Physical Review B　105　(10)　104504　2022/03/07

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.105.104504 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  15. Enhancement of transparency in epitaxially-grown p-type SnO films by surface-passivation treatment in a Na2S aqueous solution Peer-reviewed

    Suguri Uchida, Takuto Soma, Miho Kitamura, HIroshi Kumigashira, Akira OHTOMO

    Japanese Journal of Applied Physics　61　(5)　050903　2022/02/21

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ac56fa 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  16. Heavy-fermion metallic state and Mott transition induced by Li-ion intercalation in LiV2O4 epitaxial films Peer-reviewed

    Tatsuya Yajima, Takuto Soma, Kohei Yoshimatsu, Nobuyuki Kurita, Masari Watanabe, Akira Ohtomo

    Physical Review B　104　(24)　2021/12/02

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.104.245104 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  17. Optical properties of LiNbO2 thin films Peer-reviewed

    T. Kurachi, T. Yamaguchi, E. Kobayashi, T. Soma, A. Ohtomo, T. Makino

    Physica B: Condensed Matter　621　413259-413259　2021/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.physb.2021.413259 　

    ISSN： 0921-4526

  18. Superconducting Dome Underlying Bipolaronic Insulating State in Charge-doped Ti4O7 Epitaxial Films Peer-reviewed

    Takuto Soma, Tomohiro Kobayashi, Kohei Yoshimatsu, Akira Ohtomo

    Journal of the Physical Society of Japan　90　(2)　023705-023705　2021/02/15

    Publisher: Physical Society of Japan

    DOI： 10.7566/JPSJ.90.023705 　

    ISSN： 0031-9015

    eISSN： 1347-4073

  19. p-type transparent superconductivity in a layered oxide Peer-reviewed

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    Science Advances　6　(29)　eabb8570-eabb8570　2020/07

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/sciadv.abb8570 　

    eISSN： 2375-2548

    More details Close

    Development of p-type transparent conducting materials has been a challenging issue. The known p-type transparent conductors unsatisfy both of high transparency and high conductivity nor exhibit superconductivity. Here, we report on epitaxial synthesis, excellent p-type transparent conductivity, and two-dimensional superconductivity of Li1−<italic>x</italic>NbO2. The LiNbO2 epitaxial films with NbO2 sheets parallel to (111) plane of cubic MgAl2O4 substrates were stabilized by heating amorphous films. The hole doping associated with Li+ ion deintercalation triggered superconductivity below 4.2 kelvin. Optical measurements revealed that the averaged transmittance to the visible light of ~100-nanometer-thick Li1−<italic>x</italic>NbO2 was ~77%, despite the large number of hole carriers exceeding 1022 per cubic centimeter. These results indicate that Li1−<italic>x</italic>NbO2 is a previously unknown p-type transparent superconductor, in which strongly correlated electrons at the largely isolated Nb 4d<italic>z</italic>2 band play an important role for the high transparency.

  20. Electronic properties across metal-insulator transition in β-pyrochlore-type CsW2O6 epitaxial films Peer-reviewed

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    Physical Review Materials　2　115003　2018/11

    DOI： 10.1103/PhysRevMaterials.2.115003 　

  21. Insulator-to-metal transition of WO3 epitaxial films induced by electrochemical Li-ion intercalation Peer-reviewed

    Kohei Yoshimatsu, Takuto Soma, Akira Ohtomo

    APPLIED PHYSICS EXPRESS　9　(7)　075802　2016/07

    DOI： 10.7567/APEX.9.075802 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  22. Epitaxial growth of hexagonal tungsten bronze CsxWO3 films in superconducting phase region exceeding bulk limit Peer-reviewed

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    APPLIED PHYSICS EXPRESS　9　(7)　075801　2016/07

    DOI： 10.7567/APEX.9.075801 　

    ISSN： 1882-0778

    eISSN： 1882-0786

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Misc. 9

  1. 強相関遷移金属酸化物の電気化学的な電子状態の変調 Invited

    大友 明, 相馬 拓人

    応用物理　91　(6)　340-345　2022/06

    DOI： 10.11470/oubutsu.91.6_340 　

  2. ペロブスカイト型SrVO3薄膜のエピタキシャル歪みによる電子状態の変調

    小川 茉白, 相馬 拓人, 大友 明

    極低温物性研究センターだより No.35　2022

  3. Characterization of the Electronic State of LiNbO2: The Origins of a Strongly Correlated Two-Dimensional Transparent Superconductor

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    Photon Factory Activity Report 2020 #38　38　2021

  4. 層状岩塩型LiNiO2のエピタキシャル成長と電気伝導性

    矢島 達也, 相馬 拓人, 大友 明

    極低温物性研究センターだより No.34　2021

  5. Li イオン挿入反応による重い電子系スピネル型構造LiV2O4エピタキシャル薄膜の電気伝導性変調

    矢島 達也, 相馬 拓人, 大友 明

    極低温物性研究センターだより No.33　2020

  6. 電子を抜くと透明になる超伝導体とは？ – 透明性と超伝導性がともに現れるユニークな物質の起源を探る Invited

    相馬 拓人

    academist Journal　2020

  7. Metal-insulator transitions in β–pyrochlore CsW2O6 revealed by photoemission

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    Photon Factory Activity Report 2019　#37　2020

  8. β−パイロクロア型CsW2O6における特異な金属–絶縁体転移の発現機構

    相馬 拓人, 大友 明

    極低温物性研究センターだより No.32　2019

  9. 物質理工学院応用化学系 大友研究室平成28年度研究報告

    相馬 拓人, 吉松 公平, 大友 明

    極低温物性研究センターだより No.30　2017

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Presentations 150

  1. Multinary Nitrides: A New Frontier for Oxide Epitaxy Techniques

    Takuto Soma, Kodai Niitsu, Yushi Hiraide, Mitsuki Matsuura, Kohei Yoshimatsu, Akira Ohtomo, Hiroshi Kumigashira

    32nd International Workshop on Oxide Electronics (IWOE32)　2026/09/29

  2. Exploration of novel inorganic solids via thin-film chemistry Invited

    Takuto Soma, Kodai Niitsu, Kohei Yoshimatsu, Akira Ohtomo, Hiroshi Kumigashira

    Annual Meeting of the Japan Society of Vacuum and Surface Science 2026　2026/09/15

  3. Suppression of Charge Transfer in LaTiO3/LaVO3 Strongly Correlated Heterointerfaces

    Takuto Soma, Yeong Woo Kim, Kodai Niitsu, Soungmin Bae, Kohei Yoshimatsu, Hiroshi Kumigashira, Akira Ohtomo

    The 87th JSAP Autumn Meeting 2026　2026/09/08

  4. Complete strain relaxation of Ti2O3 films using multilayered hexagonal boron nitride Invited

    Keitaro Kanno, Takuto Soma, Satoru Fukamachi, Hiroki Ago, Daisuke Okuyama, Akira Ohtomo, Kohei Yoshimatsu

    The 87th JSAP Autumn Meeting 2026　2026/09/08

  5. Metal-Insulator Transition and Rattling Motion in β-Pyrochlore CsW2O6

    2026/07/07

  6. Combinatorial Epitaxial Synthesis for High-Throughput Materials Discovery of Multinary Nitrides

    Takuto Soma, Soungmin Bae, Yasuhide Mochizuki, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    Global Conference of Innovation Materials 2026 (GCIM2026)　2026/06/02

  7. 薄膜合成技術と固体化学反応を駆使した新物質・材料開拓 Invited

    相馬 拓人

    第164回結晶工学分科会研究会　2026/04/24

  8. 室温での金属絶縁体転移発現に向けたCrドープV2O3薄膜の固相合成

    藤原 穣成, 木下 裕貴, 相馬 拓人, 大友 明, 吉松 公平

    第73回応用物理学会春季学術講演会　2026/03/17

  9. (1120) V2O3薄膜における金属絶縁体転移近傍の異方的な金属伝導

    木下 裕貴, 相馬 拓人, 大友 明, 吉松 公平

    第73回応用物理学会春季学術講演会　2026/03/17

  10. 酸水酸化物AlOOH薄膜の合成と光学的評価

    関口 琢朗, 相馬 拓人, 吉松 公平, 大友 明

    第73回応用物理学会春季学術講演会　2026/03/16

  11. スパッタリング法による高品質窒化物薄膜のエピタキシャル成長

    相馬 拓人, 平出 悠士, 新津 甲大, 笹原 悠輝, 仙田 敬, 水谷 仁美, 吉松 公平, 安田 啓介, 間嶋 拓也, 組頭 広志, 大友 明

    第73回応用物理学会春季学術講演会　2026/03/16

  12. Van der Waals 物質 hBN 多層膜上に合成したTi2O3薄膜の構造解析

    菅野 圭太朗, 相馬 拓人, 深町 悟, 吾郷 浩樹, 中尾 裕則, 大友 明, 吉松 公平

    第73回応用物理学会春季学術講演会　2026/03/15

  13. 強相関窒化物薄膜の創成 Invited

    相馬 拓人

    さきがけ「未来材料」領域 2期生成果報告シンポジウム　2026/03/11

  14. “薄膜化学”による新しい無機固体材料の開拓 Invited

    相馬 拓人

    駒場材料学セミナー　2026/03/09

  15. "薄膜化学"が切り開く物性研究

    相馬 拓人

    第二回 若手研究者分野横断交流会 ー未来へ続く研究とつながりー　2026/03/05

  16. Exploration of Novel Inorganic Materials Through "Thin-Film Chemistry" Invited

    Takuto Soma

    The 3rd GP-Chem International Symposium　2026/02/20

  17. Combinatorial synthesis of multinary nitride epitaxial films

    Takuto Soma, Yushi Hiraide, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    The 2nd International Symposium on Solid-State Chemistry (ISSSC2025)　2025/12/03

  18. Phase stability in β-gallia type complex-oxide thin films: impacts of composition and crystal orientation

    Koreishi Kazuki, Kodai Niitsu, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 2nd International Symposium on Solid-State Chemistry (ISSSC2025)　2025/12/01

  19. Superconducting Dome and Quantum Criticality in Two-dimensional NbO2 Triangular Lattice

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The International Workshop on Exotic Quantum Phases due to Unhappy Electrons　2025/11/11

  20. Late Transition Metal Perovskite Oxides: Ligand Hole Metallic States and Their Instabilities Invited

    Takuto Soma

    Mini Workshop on Oxide Thermo-Iontronics　2025/10/15

  21. 薄膜合成技術を活用した無機固体材料の設計 Invited

    2025/10/11

  22. Our Recent Trial of Combinatorial Studies on Multinary Nitrides Epitaxial Films

    Takuto Soma

    Seminar in Materials Discovery and Design Group, NREL　2025/10/02

  23. Group theoretical analyses of structural phase transition in strongly correlated La3Ni2O7 from DFT+U and GW approximation

    Megumi Suzuki, Masao Obata, Takao Kotani, Takuto Soma, Toshihiro Isobe, Akira Nakajima, Yasuhide Mochizuki

    The Fifteenth International Conference on the Science and Technology for Advanced Ceramics (STAC-15)　2025/09/29

  24. Epitaxially Stabilized van der Waals Oxide: 2H-NbO2

    Takuto Soma, Aya Sato, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    31st International Workshop on Oxide Electronics (IWOE31)　2025/09/29

  25. 層状酸窒化物K2LaTa2O6Nの光触媒活性に与える前駆体酸化物の影響

    土角英也, 木下裕貴, 岡崎めぐみ, 相馬拓人, 服部真史, 石割文崇, 原亨和, 佐伯昭紀, 前田和彦

    第136回触媒討論会　2025/09/18

  26. High-quality LiTi2O4 films grown by repeated temperature-modulation epitaxy

    Shu Takashima, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 86th JSAP Autumn Meeting 2025　2025/09/10

  27. Metal-insulator transition properties of Ti2O3 films grown on van der Waals material hexagonal boron nitride

    Keitaro Kanno, Takuto Soma, Satoru Fukamachi, Hiroki Ago, Akira Ohtomo, Kohei Yoshimatsu

    The 86th JSAP Autumn Meeting 2025　2025/09/09

  28. Electrical properties of β-Ga2O3 homoepitaxial films grown by PLD

    Kazuki koreishi, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 86th JSAP Autumn Meeting 2025　2025/09/08

  29. High-Throughput Exploration of La-Nb-N Ternary Nitrides Utilizing Combinatorial Sputtering and NH3 Annealing

    Yushi Hiraide, Takuto Soma, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    The 86th JSAP Autumn Meeting 2025　2025/09/07

  30. Chemical Reactions upon Combinatorial Epitaxial Thin Films: High throughput exploration for Crystalline Phases and Physical Properties of Multinary Nitrides

    Takuto Soma, Yushi Hiraide, Hiroshi Kumigashira, Kohei Yoshimatsu, Akira Ohtomo

    The 86th JSAP Autumn Meeting 2025　2025/09/07

  31. Construction of Combinatorial Experiments for Multinary Nitride Epitaxial Thin Films

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 86th JSAP Autumn Meeting 2025　2025/09/07

  32. 3D層状結晶が生み出す新しい2D物質 : 強相関van der Waals酸化物2H-NbO2 Invited

    相馬 拓人

    学術変革領域研究(A)「２.５次元物質科学」 第3回公開シンポジウム　2025/08/06

  33. 多元系窒化物エピタキシャル薄膜のコンビナトリアル合成

    相馬 拓人, 組頭 広志, 吉松 公平, 大友 明

    第７回固体化学フォーラム研究会　2025/06/24

  34. Effects of metal cation-doping into a layered perovskite oxynitride K2LaTa2O6N on its characteristics

    Hideya Tsuchikado, Anabuki Shuji, Cretu Ovidiu, Yuki Kinoshita, Yuta Shiroma, Fan Dongxiao, Megumi Okazaki, Takuto Soma, Fumitaka Ishiwari, Shunsuke Nozawa, Toshiyuki Yokoi, Koji Kimoto, Akira Yamakata, Akinori Saeki, Kazuhiko Maeda

    The 105th CSJ Annual Meeting　2025/03/28

  35. Lattice matching of (AlxScyGa1−x−y)2O3 alloy grown on β-Ga2O3 substrate

    Kazuki koreishi, Takuto Soma, Akira Ohtomo

    2025/03/16

  36. Synthesis and Superconducting Properties of Hydridized NbN Epitaxial Thin Films

    Yushi Hiraide, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    2025/03/16

  37. Spontaneous Li Transfer in Epitaxial LiV2O4/LiTi2O4 Junction and Optical Characterizations

    Takayuki Kitamura, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    2025/03/16

  38. Electronic phase transition of Solid-state synthesized V2O3 films

    Yuki Kinoshita, Shunya Asaoka, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    2025/03/14

  39. Instability of Ligand Hole Magnetic Metallic State in Unusual High-Valent Perovskite Oxide Superlattices

    Takuto Soma, Yuki Honda, Kodai Niitsu, Yasuhide Mochizuki, Soungmin Bae, Kohei Yoshimatsu, Hiroshi Kumigashira, Akira Ohtomo

    2025/03/14

  40. コンビナトリアルスパッタリング法による多元系窒化物エピタキシャル薄膜の一括合成

    相馬 拓人, 吉松 公平, 大友 明

    日本セラミックス協会 2025年年会　2025/03/06

  41. 層状三元系窒化物 LiWN2 のアンモノリシスによる合成と結晶構造解析

    小穴 裕貴, 相馬 拓人, 三浦 章, 吉松 公平, 大友 明

    日本セラミックス協会 2025年年会　2025/03/05

  42. 多層構造と相互拡散を利用した窒化物と水素化物の合金化：ZrNxHy薄膜の作製と組成制御

    宮崎 大地, 吉松 公平, 相馬 拓人, 大友 明

    第14回 CSJ化学フェスタ2024　2024/10/24

  43. 高効率水素生成を目指したカチオンドープ層状K2LaTa2O6N光触媒の開発

    土角 英也, 城間 裕太, 木下 裕貴, 穴吹 秀士, 樊 東暁, 岡崎 めぐみ, 相馬 拓人, 石割 文崇, 野澤 俊介, 佐伯 昭紀, 山方 啓, 前田 和彦

    第14回 CSJ化学フェスタ2024　2024/10/23

  44. 薄膜で化学と物理を繋げたい Invited

    相馬 拓人

    広島未来材料研究会　2024/10/21

  45. Superconductivity and Quantum Criticality in Two-dimensional NbO2 Layers

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 30th International Workshop on Oxide Electronics　2024/10/02

  46. K2LaTa2O6Nの光 触媒活性に対する金属カチオンのドープ効果

    土角英也, 城間裕太, 木下裕貴, 樊東暁, 岡崎めぐみ, 相馬拓人, 石割文崇, 野澤俊介, 佐伯昭紀, 山方啓, 前田和彦

    第134回触媒討論会　2024/09/18

  47. p-チャネルトランジスタに向けた非晶質Ga-O-S薄膜の作製

    船田 貴光, 是石 和樹, 相馬 拓人, 吉松 公平, 大友 明

    第84回 応用物理学会秋季学術講演会　2024/09/18

  48. 層状三元系窒化物MgMoN2薄膜の固相合成

    細川 紳, 相馬 拓人, 吉松 公平, 大友 明

    第84回 応用物理学会秋季学術講演会　2024/09/16

  49. 交互ターゲットPLD法により作製したZrNxHy薄膜の仕事関数評価

    宮崎 大地, 吉松 公平, 相馬 拓人, 組頭 広志, 大友 明

    第84回 応用物理学会秋季学術講演会　2024/09/16

  50. LaTiO3エピタキシャル薄膜の輸送特性における基板と膜厚の影響

    金 榮牛, 相馬 拓人, 吉松 公平, 大友 明

    第84回 応用物理学会秋季学術講演会　2024/09/17

  51. Characterization of (100) β-(ScxGa1-x)2O3/β-Ga2O3 heterostructures grown by pulsed-laser deposition

    Kazuki Koreishi, Takuto Soma, Hiroshi Kumigashira, Akira Ohtomo

    International Workshop on Gallium Oxide and Related Materials (IWGO 2024)　2024/05/29

  52. (ScxGa1−x)2O3薄膜の偏光反射分光とバンド端構造の異方性

    是石 和樹, 尾沼 猛儀, 相馬 拓人, 大友 明

    第71回 応用物理学会春季学術講演会　2024/03/25

  53. Cu(II)原料を用いたパルスレーザ堆積法によるCuFeO2薄膜の作製

    木下 裕貴, 相馬 拓人, 吉松 公平, 大友 明

    第71回 応用物理学会春季学術講演会　2024/03/24

  54. 薄膜と化学反応を駆使した物性物理と固体化学の研究

    相馬 拓人

    CREST「未踏探索空間における革新的物質の開発 」領域 さきがけ「物質探索空間の拡大による未来材料の創製」領域 合同会議　2024/01/09

  55. Anisotropic high-pressure studies of the electronic properties in layered materials Invited

    Hiroki Takahashi, Katsumi Ujihara, Takeshi Kawahata, Akihiro Mitake, Chizuru Kawashima, Kohei Yoshimatsu, Takuto Soma, Akira Ohtomo

    MRM2023/IUMRS-ICA2023　2023/12/12

  56. Epitaxial Growth of Ultrawide Bandgap β-(ScxGa1–x)2O3 Films on β-Ga2O3 (100) Substrate by Pulsed-Laser Deposition

    Kazuki Koreishi, Takuto Soma, Akira Ohtomo

    MRM2023/IUMRS-ICA2023　2023/12/13

  57. Fabrication of Zirconium Nitride Hydride Epitaxial Films by Alternating-Target Pulsed-Laser Deposition

    Daichi Miyazaki, Ziyang Cao, Takuto Soma, Akira Ohtomo

    MRM2023/IUMRS-ICA2023　2023/12/12

  58. Quasi-particle energies and optical excitations of LiNbO2

    T. Nakamura, T Soma, A. Ohtomo, T. Makino

    2023/12/02

  59. キャリア設計とアカデミックキャリアについて Invited

    相馬 拓人

    第2回 博士のキャリアセミナー「東工大博士の先輩が語る私のキャリア設計」　2023/12/01

  60. 実験ではなく研究が楽しいステップ

    相馬 拓人

    第3回 未来材料研究会　2023/10/11

  61. 研究の本当の楽しさを知る

    相馬 拓人

    第2回 未来材料交流会　2023/10/06

  62. A van der Waals Oxide 2H-NbO2: A Half-filled Mott Insulator

    Takuto Soma, Aya Sato, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/23

  63. Evaluation of electronic states and band offsets of β-(ScxGa1−x)2O3 thin films

    Kazuki Koreishi, Takuto Soma, Hiroshi Kumigashira, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/21

  64. Superconducting Properties and Proximity Effects in Ferromagnetic Fe4N/Superconducting NbN Junction

    Yuma Yoshida, Takuto Soma, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/21

  65. Fabrication of ZrNxHy Films by Alternating-target Deposition Method and Metal-Insulator Transition

    Daichi Miyazaki, Akira Ohtomo, Takuto Soma

    The 84th JSAP Autumn Meeting　2023/09/21

  66. Synthesis of Unusually High-Valent Double-Perovskite Type LaSrFeNiO6 films

    Yuki Honda, Takuto Soma, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/21

  67. Fabrication and Li-intercalation Behaviors of Two-dimensional MoO3/Three-dimensional WO3 Epitaxial Bilayer Films

    Shin Hosokawa, Takuto Soma, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/21

  68. Non-Fermi-Liquid Behavior and Antiferromagnetic Mott Transition of Strained LaxSr1-xVO3 Films

    Mashiro Ogawa, Takuto Soma, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/21

  69. Epitaxial growth of β-(ScxGa1−x)2O3 thin films with in-plane compressive strain

    Kazuki Koreishi, Takuto Soma, Akira Ohtomo

    The 84th JSAP Autumn Meeting　2023/09/19

  70. 化学と物理の二枚舌 (生物は…？)

    相馬 拓人

    JSTさきがけ・ACT-X ４領域合同 夏祭り企画　2023/09/11

  71. Li層状酸化物におけるLi欠損の精密制御と電子機能

    相馬 拓人

    新学術領域研究「機能コアの材料科学」 若手の会・ 領域全体会議 合同会議　2023/08/01

  72. Design of strongly correlated materials using epitaxial thin-film technique and chemical reactions Invited

    Takuto Soma

    Symposium and Workshop on “Advanced Thermodynamics and Metastability”　2023/06/28

  73. Strongly correlated superconductivity in two-dimensional 2H-NbO2 layers

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 4th Workshop on Functional Materials Science (FMS2023)　2023/06/20

  74. 物性科学における研究の軸の正解を知りたい

    相馬 拓人

    さきがけ「未来材料＆⾃在配列」合同会議　2023/03/30

  75. Physical properties of double-perovskite-type oxide films prepared on miscut substrates

    Ryuki Nanno, Takuto Soma, Akira Ohtomo

    The 70th JSAP Spring Meeting　2023/03/15

  76. Metal-Insulator Transitions and Rattling Motions in β-Pyrochlore-Type Oxides

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    The 70th JSAP Spring Meeting　2023/03/17

  77. 二次元フラストレート格子NbO2層における磁気量子臨界挙動と超伝導ドーム

    相馬 拓人

    極低温研究支援センター研究発表会　2023/02/02

  78. 薄膜合成技術と化学反応を駆使した遷移⾦属酸化物の強相関物性研究 Invited

    相馬 拓人

    第１回 駒場材料学セミナー　2022/12/28

  79. Strain engineering of β-Ga2O3: Pulsed-laser deposition on (100) θ-Al2O3 templates and impacts of compressive strain on physical properties

    Kazuki Koreishi, Takuto Soma, Motohisa Kado, Akira Ohtomo

    The 4th International Workshop on Gallium Oxide and Related Materials (iWGO2022)　2022/10/24

  80. 格子歪み印加によるSrVO3の電気伝導性の変調

    小川 茉白, 相馬 拓人, 大友 明

    12th CSJ Chemistry Festa　2022/10/18

  81. 層状Li1–xNbO2薄膜のトポケミカル反応と深さ方向Li組成分析

    12th CSJ Chemistry Festa　2022/10/18

  82. Electrochemical Modulation of Electronic States in Strongly Correlated Transition-Metal Oxides Invited

    Akira Ohtomo, Tatsuya Yajima, Shuxin Zhang, Takuto Soma

    28th International Workshop on Electronic Oxides (iWOE28)　2022/10/05

  83. Epitaxy and transport properties of ferromagnetic Fe4N/superconducting NbN junctions

    Yuma Yoshida, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/22

  84. Tunable exchange bias effect in manganese- and nickel-based artificial perovskite superlattice structures

    Ramchandra Sahoo, R Nanno, Y Yamagishi, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/21

  85. Epitaxial growth of β-Ga2O3 thin films with in-plane compressive strain

    Kazuki koreishi, Takuto Soma, Motohisa Kado, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/21

  86. Superconducting Dome and Magnetic Quantum Critical Behaviors in Two-dimensional NbO2 Layers

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/21

  87. AMoO2 (A = Li, Na, K): Two-dimensional Mott insulators with tunable MoO2 interlayer distance

    Shuxin Zhang, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  88. Impact of Au surfactant on composition and optical properties of gallium oxysulfide films

    Weiqi Zhou, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  89. Fabrication of (111) oriented LaHx films with various H contents by PLD

    Ziyang Cao, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  90. Fabrication of GdMnO3/LaNiO3 superlattice structure by pulse-laser deposition

    Yuta Yamagishi, Ramchandra Sahoo, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  91. Fabrication and transport properties of SrFeO3/LaNiO3 heterostructures with polar interfaces

    Yuki Honda, Takuto Soma, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  92. Li-content control of superconducting Li1-xNbO2 films by solution treatments

    Aya Sato, Takuto Soma, Hiroshi Kumigashira, Akira Ohtomo

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  93. 二次元三角格子2H-NbO2層における強相関電子と超伝導

    相馬 拓人, 吉松 公平, 堀場 弘司, 組頭 広志, 大友 明

    日本物理学会 2022年秋季大会　2022/09/15

  94. Heteroepitaxial growth of molybdenum bronzes for exploring dimensionality- and composition-controlled electronic properties

    Shuxin ZHANG, Takuto SOMA, Akira OHTOMO

    The 5th International Union of Materials Research Societies International Conference of Young Researchers on Advanced Materials (IUMRS-ICYRAM 2022)　2022/08/04

  95. Thin-film growth and work-function characterizations of group IV transition-metal hydrides and nitrides

    Ziyang Cao, Ryoichiro Hayashi, Takuto Soma, Akira Ohtomo

    The 69th JSAP Spring Meeting　2022/03/25

  96. [The 51st Young Scientist Presentation Award Speech] Modulation of properties in strongly correlated oxide films by Li-ion (de)intercalation Invited

    Tatsuya Yajima, Shuxin Zhang, Aya Sato, Takuto Soma, Akira Ohtomo

    The 69th JSAP Spring Meeting　2022/03/23

  97. Bandwidth control and effective-mass divergence in SrVO3 films by epitaxial strain

    Mashiro Ogawa, Takuto Soma, Akira Ohtomo

    The 69th JSAP Spring Meeting　2022/03/22

  98. Spin glass like behavior and giant exchange bias generated by B-antisite disorder in double-perovskite-type La2MnCoO6 films

    Shutong Zhang, Ramchandra Sahoo, Takuto Soma, Akira Ohtomo

    The 69th JSAP Spring Meeting　2022/03/22

  99. Work-Function Control of Metallic IV Compounds by Anion Engineering

    Ziyang Cao, Ryoichiro Hayashi, Takuto Soma, Akira Ohtomo

    Material Research Meeting 2021 (MRM2021)　2021/12/16

  100. Epitaxial Growth of p-Type SnO Films and Soft Chemical Sulfurization

    Suguri Uchida, Takuto Soma, Akira Ohtomo

    Material Research Meeting 2021 (MRM2021)　2021/12/14

  101. Electrical Conductivity of LiNiO2 Films with Two-dimensional NiO2 Layers

    Tatsuya Yajima, Takuto Soma, Akira Ohtomo

    Material Research Meeting 2021 (MRM2021)　2021/12/14

  102. Anisotropic Pressure Effect on Superconducting and Bipolaronic Insulator to Metal Transition in Ti4O7 Epitaxial Film International-presentation

    Yuto Kikuchi, Chizuru Kawashima, Kouhei Ishida, Hayato Kamioka, Hiroki Takahashi, Kohei Yoshimatsu, Takuto Soma, Akira Ohtomo

    10th Asian Conference on High pressure Research (ACHPR 10)

  103. High-pressure study of superconductivity and bipolaronic insulator to metal transition in Ti4O7 film International-presentation Invited

    Hiroki Takahashi, Yuto Kikuchi, Chizuru Kawashima, Kouhei Ishida, Hayato Kamioka, Kohei Yoshimatsu, Takuto Soma, Akira Ohtomo

    European Materials Research Society (E-MRS) 2021 Fall Meeting　2021/09/20

  104. マグネリ相チタン酸化物の異方的圧力効果

    菊池佑斗, 川島千弦, 石田康平, 上岡隼人, 高橋博樹, 吉松公平, 相馬拓人, 大友明

    日本物理学会 2021年秋季大会　2021/09/20

  105. Effects of epitaxial strain on the electronic states of perovskite-type vanadates: analyses based on Fermi liquid theory and band calculation

    Takuto Soma, Hirokazu Okabe, Akira Ohtomo

    The 82th JSAP Autumn Meeting　2021/09/13

  106. Fabrication of p-type transparent SnO films and examination of sulfurization process with using solution reactions

    Suguri Uchida, Takuto Soma, Akira Ohtomo

    The 82th JSAP Autumn Meeting　2021/09/12

  107. Li-ion intercalation to LiV2O4 epitaxial films and in-situ structural analysis

    Tatsuya Yajima, Takuto Soma, Akira Ohtomo

    The 82th JSAP Autumn Meeting　2021/09/12

  108. Control of B-antisite disorder and observation of exchange bias in double-perovskite-type La2MnCoO6 films

    Shutong Zhang, Ramchandra Sahoo, Takuto Soma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Osami Sakata, Akira Ohtomo

    The 82th JSAP Autumn Meeting　2021/09/10

  109. Examination of thin-film synthesis of layered NbO2 with topochemical reactions

    Aya Sato, Takuto Soma, Akira Ohtomo

    The 82th JSAP Autumn Meeting　2021/09/10

  110. A p-type transparent conducting oxide with 2D superconductivity Invited

    Akira Ohtomo, Takuto Soma

    2021 MRS Spring Meeting & Exhibit　2021/04/18

  111. Characterization of γ-Al2O3/β-Ga2O3 interface with photo-assisted capacitance-voltage method

    Nan Zhang, Takumi Saito, Kaisei Kamei, Takuto Soma, Akira Ohtomo

    The 68th JSAP Spring Meeting　2021/03/19

  112. Investigation of impact of orientation on electronic properties in epitaxially grown MoO2 films

    Shuxin Zhang, Takuto Soma, Akira Ohtomo

    The 68th JSAP Spring Meeting　2021/03/19

  113. Thin-film growth of N-doped Ga2(O1−xSx)3 by using pulsed-laser deposition

    Takumi Saito, Yuta Ihara, Takuto Soma, Motohisa Kado, Akira Ohtomo

    The 68th JSAP Spring Meeting　2021/03/19

  114. Epitaxial growth of layered-rock-salt type LiNiO2

    Tatsuya Yajima, Takuto Soma, Akira Ohtomo

    The 68th JSAP Spring Meeting　2021/03/19

  115. Fabrication of CrN/NiO superlattice structures towards realizing Ni-N bonds

    Daichi Sato, Akira Ohtomo, Takuto Soma, Ryo Yokoyama

    The 68th JSAP Spring Meeting　2021/03/18

  116. 透明導電体としての強相関酸化物 Invited

    相馬 拓人

    第10回 酸化物研究の新機軸に向けた学際討論会　2021/03/02

  117. Strongly correlated electrons and superconductivity in two-dimensional triangular lattice NbO2 layer Invited

    2021/01/27

  118. エピタキシャル薄膜成⻑と化学反応を駆使した遷移⾦属化合物 の強相関物性開拓 Invited

    相馬 拓人

    第4回 大岡山-すずかけ台合同若手研究会　2021/01/12

  119. スピネル・層状岩塩型構造バナジウム酸リチウムのエピタキシャル成長と電気化学的イオン脱挿入

    矢島 達也, 大友 明, 相馬 拓人

    第46回固体イオニクス討論会　2020/12/08

  120. 電気化学反応を用いたフィリング制御による「電子の重さ」の変調

    矢島 達也, 相馬 拓人, 大友 明

    第10回 CSJ化学フェスタ2020　2020/10/22

  121. 巨大交換バイアスの実現に向けたLa2MnCoO6 薄膜のBサイト秩序度制御による磁気特性の変調

    張 樹桐, 武内 優, 相馬 拓人, 大友 明

    第10回 CSJ化学フェスタ2020　2020/10/22

  122. Examination of transformation method to ordered alloy thin films using metal oxide artificial superlattice precursors

    Yutaro Noguchi, Takuto Soma, Kohei Yoshimatsu, Osami Sakata, Akira Ohtomo

    The 67th JSAP Spring Meeting　2020/03/14

  123. Epitaxial growth of ScN thin films using pulsed-laser deposition

    Daichi Sato, Ryo Yokoyama, Takuto Soma, Akira Ohtomo

    The 67th JSAP Spring Meeting　2020/03/13

  124. Non-equilibrium thin-film growth and control of magnetic properties of La2MnCoO6 toward realizing giant exchange bias

    Shutong Zhang, Yuu Takeuchi, Takuto Soma, Akira Ohtomo

    The 67th JSAP Spring Meeting　2020/03/13

  125. Relationships between oxidation state and superconductivity in Ti4O7 films

    Tomohiro Kobayashi, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 67th JSAP Spring Meeting　2020/03/13

  126. PLD growth of Ga2O3 based solid-solution films using GaS

    Kohei Aoyama, Takumi Saito, Kaisei Kamei, Mizuhito Takahashi, Takuto Soma, Motohisa Kado, Akira Ohtomo

    The 67th JSAP Spring Meeting　2020/03/12

  127. Transparency and Two-dimensional Hole Superconductivity in Li1−xNbO2 International-presentation

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    Materials Research Meeting 2019 (MRM 2019)　2019/12

  128. Epitaxial thin film growth by PLD method: selective crystal synthesis of layered rocksalt-type LiVO2 and spinel-type LiV2O4

    Tatsuya Yajima, Takuto Soma, Akira Ohtomo

    The 8th CSJ Chemistry Festa　2019/10

  129. Electrochemical doping to early-transition-metal oxide superconductors International-presentation

    Takuto Soma, Tatsuya Yajima, Shuxin Zhang, Akira Ohtomo

    26th International Workshop on Oxide Electronics (iWOE26)　2019/09

  130. Epitaxial stabilization of metastable β-MoO3 films for reversible Li-ion intercalation International-presentation

    Shuxin Zhang, Takuto Soma, Tatsuya Yajima, Akira Ohtomo

    26th International Workshop on Oxide Electronics (iWOE26)　2019/09

  131. Highly reversible Li-ion (de)intercalation to metastable β-MoO3

    Shuxin Zhang, Takuto Soma, Tatsuya Yajima, Akira Ohtomo

    The 80th JSAP Autmun Meeting　2019/09

  132. Selective growth of layered rock-salt-type LiVO2 and spinel-type LiV2O4 films by PLD

    Tatsuya Yajima, Takuto Soma, Akira Ohtomo

    The 80th JSAP Autmun Meeting　2019/09

  133. Single band two-dimensional hole superconductivity in transparent Li1−xNbO2 thin films

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    The 80th JSAP Autmun Meeting　2019/09

  134. Two-dimensional hole superconductivity in transparent Li1−xNbO2 epitaxial films International-presentation

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    26th International Workshop on Oxide Electronics (iWOE26)　2019/09

  135. Thin-film growth and conductivity control of layered p-type semiconductor LiRhO2

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 66th JSAP Spring Meeting　2019/03

  136. p-type transparent superconductivity in layered LiNbO2: exotic electronic states associated with the NbO6 triangular prism

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    The 66th JSAP Spring Meeting　2019/03

  137. Electrochemical Li-Ion Intercalation for Control of Electronic Phases in Transition-Metal Oxide Epitaxial Films International-presentation

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    2018 MRS Fall Meeting & Exhibit　2018/11

  138. Mosulation of electric conductivity of heavy-fermion spinel LiV2O4 by electrochemical reaction

    Tatsuya Yajima, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 8th CSJ Chemistry Festa　2018/10

  139. Epitaxial growth and electrochemical Li intercalation of heavy fermion spinel LiV2O4

    Tatsuya Yajima, Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 79th JSAP Autmun Meeting　2018/09

  140. Synthesis of layered LiNbO2 thin films and control of their superconducting properties by using Li-ion charging/discharging reactions

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 79th JSAP Autmun Meeting　2018/09

  141. Impact of hole-doping on metal-insulator transition in β-pyrochlore-type CsW2O6

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    The 65th JSAP Spring Meeting　2018/03

  142. Epitaxial growth and magnetic transport properties of β-pyrochlore-type CsW2O6 single crystal films

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    JPS 73rd Annual Meeting　2018/03

  143. Reversible control of electronic phases for tungsten oxides by electrochemical intercalation

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 7th CSJ Chemistry Festa　2017/10

  144. [JSAP Young Scientist Award Speech] Metal-insulator transition and electronic structure of β-pyrochlore-type CsW2O6 Invited

    Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

    The 78th JSAP Autmun Meeting　2017/09

  145. Electrochemical modulation of electronic states for tungsten oxide epitaxial films International-presentation

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 10th International Conference on the Science and Technology for Advanced Ceramics　2017/08

  146. Epitaxial growth and physical properties of β-pyrochlore-type CsW2O6 films

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 64th JSAP Spring Meeting　2017/03

  147. Control of superconducting properties of CsxWO3 films by electrochemical ion intercalation International-presentation

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 8th Multidisciplinary International Student Workshop　2016/08

  148. Fabrication of CsxWO3 epitaxial films and modulation of their superconducting properties

    Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

    The 63rd JSAP Spring Meeting　2016/03

  149. Metallization of WO3 epitaxial films using Li-ion electrochemical intercalation International-presentation

    Takuto Soma, Kohei Yoshimatsu, Takayoshi Oshima, Akira Ohtomo

    The 9th International Conference on the Science and Technology for Advanced Ceramics　2015/10

  150. Metallic conductivity of WO3 epitaxial thin film using electrochemical Li intercalation

    Takuto Soma, Kohei Yoshimatsu, Mifuyu Niwa, Takayoshi Oshima, Akira Ohtomo

    The 62nd JSAP Spring Meeting　2015/03

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Industrial Property Rights 2

  1. 酸化ガリウム系半導体の製造方法

    加渡 幹尚, 大友 明, 相馬 拓人, 是石 和樹

    特許7856527

    Property Type: Patent

  2. 酸化ガリウム系半導体の製造方法

    加渡 幹尚, 大友 明, 相馬 拓人

    特許7477407

    Property Type: Patent

Research Projects 19

  1. 薄膜を駆使した超セラミックスの設計と電子物性への展開 Competitive

    相馬 拓人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 学術変革領域研究(A)

    Institution: 東京科学大学

    2025/04 - 2027/03

  2. 薄膜における超高速分光: 準安定量子物質における非平衡電子相の開拓

    Offer Organization: 豊田理化学研究所

    System: 2025年度 豊田理化学研究所 「豊田理研スカラー共同研究」

    2025/04 - 2026/03

  3. Creation of New 2D Materials Produced by 3D Layered Crystals Competitive

    2024/04 - 2026/03

  4. Creation of strongly correlated nitride thin films Competitive

    Offer Organization: Japan Science and Technology Agency (JST)

    System: PRESTO

    Institution: Tokyo Institute of Technology

    2022/10 - 2026/03

  5. "複合アニオンアモルファス半導体"の創製 Competitive

    Offer Organization: 豊田理化学研究所

    System: 2024年度「豊田理研スカラー」

    2024/04 - 2025/03

  6. Creation of "mixed-anion amorphous semiconductors" Competitive

    2024/04 - 2025/03

  7. 新しいセラミックス電子材料-共有結合性金属-の開拓 Competitive

    Offer Organization: 大倉和親記念財団

    System: 2023年度 大倉和親記念財団 研究助成 若手研究者部門

    2023/12 - 2025/03

  8. 酸化鉄の結晶方位制御による高効率水素生成光触媒の実現 Competitive

    Offer Organization: 公益財団法人ＪＦＥ２１世紀財団

    System: 公益財団法人ＪＦＥ２１世紀財団・技術研究助成 地球環境・地球温暖化防止技術研究

    2024/01 - 2025/01

  9. 酸化物二次元材料の実現 Competitive

    Offer Organization: 泉科学技術振興財団

    System: 2023年度 泉科学技術振興財団 2023年度研究助成

    2023/10 - 2024/09

  10. 窒化物二次元物質の実現 Competitive

    Offer Organization: 東京工業大学

    System: 東京工業大学 物質理工学院 2023年度 物質理工学院 研究奨励賞

    2023/04 - 2024/03

  11. Crystal defects and electronic functions in highly crystalline epitaxial thin films

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Tokyo Institute of Technology

    2022/04 - 2024/03

  12. All-solid-state nonvolatile superconducting transistors realized by ion transfer Competitive

    Offer Organization: The Foundation for The Promotion of Ion Engineering

    2020/09 - 2022/03

  13. Elucidation of two-dimensional NbO2 superconducting layer realized by epitaxial films

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tokyo Institute of Technology

    2020/04 - 2022/03

  14. 二次元透明超伝導体が示す“重い”電子の解明

    相馬 拓人

    System: 2020年度 大隅良典基礎研究支援

    2021/02 - 2022/01

  15. Realization of two-dimensional oxide

    Offer Organization: Tokyo Institute of Technology

    Institution: Tokyo Institute of Technology

    2020/04 - 2021/03

  16. Elucidation of thin-film growth of p-type transparent superconductor Li1-xNbO2 and application with low-cost Competitive

    Institution: Tokyo Institute of technology

    2020/04 - 2021/03

  17. Development and control of novel physical properties of transition metal oxides by applying the principle of lithium ion battery

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

    Category: Grant-in-Aid for JSPS Fellows

    Institution: Tokyo Institute of Technology

    2018/04 - 2020/03

  18. Development of electroactive materials through the analysis of electronic phase diagrams of epitaxial transition-metal oxides

    OHTOMO Akira, MATSUMOTO Yuji, KUMIGASHIRA Hiroshi, YOSHIMATSU Kohei, MASHIKO Hisanori, NAKAMURA Kentaro, KUROKAWA Hikaru, SOMA Takuto

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tokyo Institute of Technology

    2015/04/01 - 2018/03/31

    More details Close

    The transition-metal oxides, such as titania and hematite, are conventional materials utilized in various electrochemical cells because of their non-toxic, earth-abundant, and stable nature. This research aims at adding new electrochemical functionalities to them by combining the power of epitaxial growth techniques and newly developed phase-diagram analysis method. We implemented a compact electrochemical cell to test a number of thin-film samples. Representative achievements are summarized as follows: (i) band-gap narrowing in ferrite based films and orientation control of hematite films resulted in substantial improvement of visible-light driven photoelectrochemical water oxidations; (ii) complete and reversible superconductor-insulator transitions in lithium titanate films were achieved by Li-ion electrochemical reactions; (iii) superconductivity in higher titanium oxides films was discovered. Our approach is a powerful way to find new functionalities for sustainable society.

  19. ロジウム・イリジウム酸化物を活用した新奇電子物性の開拓と薄膜デバイス応用 Competitive

    相馬 拓人

    Offer Organization: 田中貴金属記念財団

    System: 2020年度「貴金属に関わる研究助成金」

    Category: 奨励賞

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Teaching Experience 4

  1. Exercise in Analytical Chemistry　Tokyo Institute of Technology

  2. Chemical Engineering and Industrial Chemistry Laboratory II b/a　Tokyo Institute of Technology

  3. 実践応用化学第一（TA）　東京工業大学

  4. 応用化学実験第二（TA）　東京工業大学

Media Coverage 6

  1. はがせない酸化物をはがせるようにする新技術 Myself

    Science Tokyo 研究ニュース

    2026/12

    Type: Internet

  2. From layered transition metal oxide to 2D material: the discovery of 2H-NbO2 Myself

    Science Tokyo Press release

    2025/09

    Type: Internet

  3. 二次元ファンデルワールス酸化物の合成に成功 Myself

    Science Tokyo プレスリリース

    2025/08

    Type: Internet

  4. 東工大ら、透明なp型超伝導体となる物質発見 世界初

    財経新聞

    2020/07

    Type: Newspaper, magazine

  5. 電子を抜くと透明な超伝導になる物質を発見 －世界初のp型透明超伝導体を実現－

    日本経済新聞

    2020/07

    Type: Newspaper, magazine

  6. ｐ型透明超伝導体を開発 東工大・東北大 層状ニオブ酸リチウム利用

    日刊工業新聞　朝刊21面

    2020/07

    Type: Newspaper, magazine

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Academic Activities 2

  1. 第3回 未来材料研究会 主催

    2023/10/11 - 2023/10/11

    Activity type: Academic society, research group, etc.

  2. 第13回 未来材料セミナー 世話人

    2023/08/02 - 2023/08/02

    Activity type: Academic society, research group, etc.