Semiconductor-based topological superconducting spintronics: Creation of next-generation quantum information infrastructure

• Project/Area Number: 23K17324
• Research Category: Grant-in-Aid for Challenging Research (Pioneering)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: 田中 雅明 東京大学, 大学院工学系研究科(工学部), 教授 (30192636)
• Co-Investigator(Kenkyū-buntansha): Le DucAnh 東京大学, 大学院工学系研究科(工学部), 准教授 (50783594)
• Project Period (FY): 2023-06-30 – 2027-03-31
• Project Status: Granted (Fiscal Year 2023)
• Budget Amount: ¥25,870,000 (Direct Cost: ¥19,900,000、Indirect Cost: ¥5,970,000); Fiscal Year 2026: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000); Fiscal Year 2025: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000); Fiscal Year 2024: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2023: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
• Keywords: 強磁性半導体 / スピン / ヘテロ構造 / バンド構造 / トポロジカル / 超伝導 / デバイス / 次世代量子情報基盤

Outline of Research at the Start

本研究では、エラーに強い量子情報技術のプラットフォームとして、申請者が独自に開発してきた強磁性半導体をベースとしたヘテロ接合のエピタキシャル成長と材料技術を活用し、半導体-強磁性-超伝導の機能をもつ複合構造を形成して、トポロジカル物性を解明する。、さらに、Majorana準粒子状態を観測、無磁場でゲート電圧で制御することによって、ロバスト性が高い究極のトポロジカル量子情報技術のハードウェア基盤を創ることを目指す。

Outline of Annual Research Achievements

量子情報技術の大きな課題であった外乱に強いプラットフォームを構築するため、申請者が開発した強磁性半導体をベースとしたヘテロ接合材料技術を駆使して、半導体-強磁性-超伝導の機能をもつ複合構造を形成し、Majorana準粒子状態を観測、ゼロ磁場でゲート電圧で制御することで、ロバスト性が高い究極のトポロジカル量子情報技術基盤を創ることを目的としている。今年度は以下の研究を行った。
（１）究極の狭ギャップ半導体として、世界最高品質の単結晶ダイヤモンド型結晶構造をもつα-Sn薄膜をIII-V族半導体InSb上にエピタキシャル成長することに成功した。量子輸送測定と解析により、α-Snがトポロジカル・ディラック半金属であること、膜厚を薄くすると２次元トポロジカル絶縁体（および通常の絶縁体になるなど、多様なトポロジカル相を持つことを示した。
（２）上記のα-Sn（トポロジカル物質）のエピタキシャル薄膜にEBやレーザ描画によってβ-Sn（超伝導体）の任意形状のパターンを書き込むことに成功した（2022年7月14日サイトビジットでのスライド資料p.43参照）。マヨラナ束縛状態は超伝導体の界面に存在することが理論的にわかっているので、この技術はトポロジカル量子回路の作製方法として有望であり、研究を進めている。
（３）InAs/InFeAsからなる量子井戸構造において、電子の波動関数操作によりピコ秒以下の超高速で磁化制御を実現し、テラヘルツ周波数帯で動作する低消費電力スピンデバイスに向けて新機能を実証した。
（４）非磁性半導体InAs/強磁性半導体GaFeSbからなるヘテロ接合を作製し、非磁性半導体に大きなスピン分裂（18meV）を観測し、電圧で制御できることを実証した。

Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

2023年度は1年目であるが、強磁性半導体／非磁性半導体ヘテロ構造、量子井戸構造、トポロジカル物質／超伝導体からなるヘテロ構造の作製に成功し、その量子効果・量子現象を観測し、成果を論文にまとめるところまで到達した。

Strategy for Future Research Activity

引き続き、強磁性半導体／非磁性半導体ヘテロ構造、量子井戸構造、トポロジカル物質／超伝導体からなるヘテロ構造の作製技術を高め、機能開発とデバイス応用を行う。

Research Products

• [Journal Article] Identification of electronic dimensionality reduction in semiconductor quantum well structures (2024)
  • Author(s): Takeda Takahito、Takase Kengo、Strocov Vladimir N.、Tanaka Masaaki、Kobayashi Masaki
  • Journal Title: Journal of Electron Spectroscopy and Related Phenomena Volume: 270 Pages: 147406-147406
  • DOI: 10.1016/j.elspec.2023.147406
  • Peer Reviewed
• [Journal Article] Allotropic transition of Dirac semimetal α-Sn to superconductor β-Sn induced by focused-ion-beam irradiation (2024)
  • Author(s): Inagaki Kohdai、Ishihara Keita、Hotta Tomoki、Seki Yuichi、Takeda Takahito、Ishida Tatsuhiro、Ootsuki Daiki、Kawasaki Ikuto、Fujimori Shin-Ichi、Tanaka Masaaki、Anh Le Duc、Kobayashi Masaki
  • Journal Title: Applied Physics Letters Volume: 124 Issue: 2
  • DOI: 10.1063/5.0177343
  • Peer Reviewed
• [Journal Article] Observation of large spin-polarized Fermi surface of a magnetically proximitized semiconductor quantum well (2024)
  • Author(s): Shiratani Harunori、Takiguchi Kosuke、Anh Le Duc、Tanaka Masaaki
  • Journal Title: Communications Physics Volume: 7 Issue: 1
  • DOI: 10.1038/s42005-023-01485-6
  • Peer Reviewed / Open Access
• [Journal Article] Reduced dead layers and magnetic anisotropy change in La2/3Sr1/3MnO3 membranes released from an SrTiO3 substrate (2024)
  • Author(s): Arai Takuma、Kaneta-Takada Shingo、Anh Le Duc、Kobayashi Masaki、Seki Munetoshi、Tabata Hitoshi、Tanaka Masaaki、Ohya Shinobu
  • Journal Title: Applied Physics Letters Volume: 124 Issue: 6 Pages: 1-6
  • DOI: 10.1063/5.0180288
  • Peer Reviewed
• [Journal Article] Colossal magnetoresistive switching induced by d0 1 ferromagnetism of MgO in a semiconductor nanochannel device with ferromagnetic Fe/MgO electrodes" (2024)
  • Author(s): Ohya Shinobu、Tsuruoka Shun、Kaneda Masaya、Shinya Hikari、Fukushima Tetsuya、Takeda Takahito、Tadano Yuriko、Endo Tatsuro、Anh Le Duc、Masago Akira、Katayama‐Yoshida Hiroshi、Tanaka Masaaki
  • Journal Title: Advanced Materials Volume: - Issue: 23 Pages: 2307389-2307389
  • DOI: 10.1002/adma.202307389
  • Peer Reviewed / Open Access
• [Journal Article] Ferromagnetism induced by hybridization of Fe 3d orbitals with ligand InSb bands in n-type ferromagnetic semiconductor (In,Fe)Sb (2023)
  • Author(s): Okano Ryo、Hotta Tomoki、Takeda Takahito、Araki Kohsei、Takase Kengo、Anh Le Duc、Sakamoto Shoya、Takeda Yukiharu、Fujimori Atsushi、Tanaka Masaaki、Kobayashi Masaki
  • Journal Title: Physical Review B Volume: 107 Issue: 20
  • DOI: 10.1103/physrevb.107.205205
  • Peer Reviewed
• [Journal Article] Scattering-dependent transport of SrRuO3 films: From Weyl fermion transport to hump-like Hall effect anomaly (2023)
  • Author(s): Kaneta-Takada Shingo、Wakabayashi Yuki K.、Krockenberger Yoshiharu、Irie Hiroshi、Ohya Shinobu、Tanaka Masaaki、Taniyasu Yoshitaka、Yamamoto Hideki
  • Journal Title: Physical Review Materials Volume: 7 Issue: 5 Pages: 1-8
  • DOI: 10.1103/physrevmaterials.7.054406
  • Peer Reviewed / Open Access
• [Journal Article] Giant Spin‐Valve Effect in Planar Spin Devices Using an Artificially Implemented Nanolength Mott‐Insulator Region (2023)
  • Author(s): Endo Tatsuro、Tsuruoka Shun、Tadano Yuriko、Kaneta‐Takada Shingo、Seki Yuichi、Kobayashi Masaki、Anh Le Duc、Seki Munetoshi、Tabata Hitoshi、Tanaka Masaaki、Ohya Shinobu
  • Journal Title: Advanced Materials Volume: 未定 (Accepted) Issue: 28 Pages: 2300110-2300110
  • DOI: 10.1002/adma.202300110
  • Peer Reviewed / Open Access
• [Journal Article] Electric Field Control of Spin?Orbit Torque Magnetization Switching in a Spin?Orbit Ferromagnet Single Layer (2023)
  • Author(s): Jiang Miao、Asahara Hirokatsu、Ohya Shinobu、Tanaka Masaaki
  • Journal Title: Advanced Science Volume: 10 Issue: 24 Pages: 2301540-2301540
  • DOI: 10.1002/advs.202301540
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Control of magnetic anisotropy by epitaxial strain in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>n</mml:mi></mml:math>-type ferromagnetic semiconductor (In,Fe)Sb (2023)
  • Author(s): Pillai Akhil、Goel Shobhit、Anh Le Duc、Tanaka Masaaki
  • Journal Title: Physical Review B Volume: 108 Issue: 1
  • DOI: 10.1103/physrevb.108.014421
  • Peer Reviewed
• [Journal Article] Ultrafast Subpicosecond Magnetization of a 2D Ferromagnet (2023)
  • Author(s): Anh Le Duc、Kobayashi Masaki、Takeda Takahito、Araki Kohsei、Okano Ryo、Sumi Toshihide、Horio Masafumi、Yamamoto Kohei、Kubota Yuya、Owada Shigeki、Yabashi Makina、Matsuda Iwao、Tanaka Masaaki
  • Journal Title: Advanced Materials Volume: 35 Issue: 40
  • DOI: 10.1002/adma.202301347
  • Peer Reviewed / Open Access
• [Journal Article] Quantitative characterization of current-induced self-spin?orbit torques in a perpendicularly magnetized (Ga,Mn)As single thin film (2023)
  • Author(s): Wang Chenda、Jiang Miao、Ohya Shinobu、Tanaka Masaaki
  • Journal Title: Applied Physics Letters Volume: 123 Issue: 15 Pages: 152402-152402
  • DOI: 10.1063/5.0170652
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Growth, crystal structures, and magnetic properties of Fe?As films grown on GaAs (111)B substrates by molecular beam epitaxy (2023)
  • Author(s): Aota Seiji、Anh Le Duc、Tanaka Masaaki
  • Journal Title: Journal of Applied Physics Volume: 134 Issue: 23
  • DOI: 10.1063/5.0177679
  • Peer Reviewed
• [Presentation] Ultrafast enhancement of magnetization in ferromagnetic semiconductor (In,Fe)As quantum wells (2024)
  • Author(s): Le Duc Anh, Masaki Kobayashi, Takahito Takeda, Toshihide Sumi, Masafumi Horio, Kohei Yamamoto, Yuya Kubota, Shigeki Owada, Makina Yabashi, Iwao Matsuda, Masaaki Tanaka
  • Organizer: American Physical Society (APS) March Meeting 2024
  • Int'l Joint Research
• [Presentation] Giant odd-parity magnetoresistance in a topological material / ferromagnet bilayer heterostructure (2024)
  • Author(s): Tomoki Hotta, Le Duc Anh, Takahiro Chiba, Yohei Kota, and Masaaki Tanaka
  • Organizer: American Physical Society (APS) March Meeting 2024
  • Int'l Joint Research
• [Presentation] Superconducting transition in a topological Dirac semimetal α-Sn thin film (2024)
  • Author(s): Tomoki Hotta, Le Duc Anh, and Masaaki Tanaka
  • Organizer: American Physical Society (APS) March Meeting 2024
  • Int'l Joint Research
• [Presentation] Topological phase transition induced by the magnetic proximity effect (2024)
  • Author(s): Soichiro Fukuoka, Tomoki Hotta, Le Duc Anh, Takahiro Chiba, Yohei Kota, and Masaaki Tanaka
  • Organizer: American Physical Society (APS) March Meeting 2024
  • Int'l Joint Research
• [Presentation] Epitaxial growth and characterization of superconductor Al / ferromagnetic semiconductor (In,Fe)As heterostructures on InP substrates (2024)
  • Author(s): Hirotaka Hara, Keita Ishihara, Le Duc Anh, Hikari Shinya, and Masaaki Tanaka
  • Organizer: American Physical Society (APS) March Meeting 2024
  • Int'l Joint Research
• [Presentation] Observation of unconventional superconducting phenomena in superconducting α-Sn thin films (2024)
  • Author(s): Daiki Nishigaki, Tomoki Hotta, Masaaki Tanaka, Le Duc Anh
  • Organizer: American Physical Society (APS) March Meeting 2024
  • Int'l Joint Research
• [Presentation] 研究室CSRN/Spin-RNJの紹介 (2024)
  • Author(s): 田中雅明
  • Organizer: 「Agile-X 革新的半導体の民主化拠点」全体会議
• [Presentation] バンド交差とスピン軌道相互作用により誘起される高効率スピン流-電流変換 (Highly efficient spin-charge conversion induced by band crossing and spin-orbit interaction) (2024)
  • Author(s): 金田真悟、田中雅明、大矢忍
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Fe/MgO/Geにおける抵抗スイッチ効果のスピントロニクス機能 (Spintronics function of the resistive switching in Fe/MgO/Ge) (2024)
  • Author(s): Masaya Kaneda, Shun Tsuruoka, Hiroshi Katayama-Yoshida, Tatsuro Endo, Yuriko Tadano, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Enhancement of double-exchange interaction in a La2/3Sr1/3MnO3 membrane released from epitaxial strain (2024)
  • Author(s): Takahito Takeda, Takuma Arai, Kohei Yamagami, Le Duc Anh, Masaaki Tanaka, Masaki Kobayashi, and Shinobu Ohya
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] 強磁性金属Fe / トポロジカル・ディラック半金属α-Snヘテロ接合におけるスピン流-電流変換 (Spin-Charge Conversion in Ferromagnetic Metal / Topological Dirac Semimetal alpha-Sn Heterostructures) (2024)
  • Author(s): 石田正雪、福岡蒼一郎、田中雅明、レデゥックアイン
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Enhanced Magnetization and Change in Magnetic Anisotropy in La2/3Sr1/3MnO3 membranes Released from a Substrate (2024)
  • Author(s): Takuma Arai, Shingo Kaneta-Takada, Le Duc Anh,Masaki Kobayashi,Munetoshi Seki, Hitoshi Tabata, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Spin injection through a Si-based ferromagnetic tunnel junction: A band diagram model (2024)
  • Author(s): Baisen Yu, Shoichi Sato, Masaaki Tanaka, and Ryosho Nakane
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Quantum oscillations and Odd-parity Magnetoresistance in α-Sn/(In,Fe)Sb heterostructure (2024)
  • Author(s): 堀田智貴, Le Duc Anh, 田中雅明
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Topological Dirac semimetal α-Sn / superconducting β-Sn in-plane heterostructures by laser lithography (2024)
  • Author(s): 佐伯崇寛、石原奎太、レデゥックアイン、田中雅明
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Spin Polarization and Magnetoresistance in a Si-based Spin MOSFET (2024)
  • Author(s): 佐藤彰一、田中雅明、中根了昌
  • Organizer: 第15回低温科学研究センター研究交流会
• [Presentation] Mechanism of enhanced double-exchange interaction in a La2/3Sr1/3MnO3 membrane free from epitaxial strain (2024)
  • Author(s): Takahito Takeda, Takuma Arai, Kohei Yamagami, Le Duc Anh, Masaaki Tanaka, Masaki Kobayashi, and Shinobu Ohya
  • Organizer: 第27回半導体におけるスピン工学の基礎と応用 (PASPS-27)
• [Presentation] Spin Polarization and Magnetoresistance in a Si-based Spin MOSFET (2024)
  • Author(s): Sato Shoichi, Tanaka Masaaki, Nakane Ryosho
  • Organizer: 第27回半導体におけるスピン工学の基礎と応用 (PASPS-27)
• [Presentation] Enhanced Magnetization and Change in Magnetic Anisotropy in La2/3Sr1/3MnO3 membranes Released from a Substrate (2024)
  • Author(s): T. Arai, S. Kaneta-Takada, L. D. Anh, M. Kobayashi, M. Seki, H. Tabata, M. Tanaka, and S. Ohya
  • Organizer: 第27回半導体におけるスピン工学の基礎と応用 (PASPS-27)
• [Presentation] Efficient spin-orbit-torque single-layer magnetization switching in SrRuO3 induced by enhanced spin Berry curvature by oxygen octahedral rotation (2024)
  • Author(s): H. Horiuchi, Y. K. Wakabayashi, Y. Araki, J. Ieda, M. Yamanouchi, S. Kaneta-Takada, Y. Taniyasu, H. Yamamoto, Y. Krockenberger, M. Tanaka and S. Ohya
  • Organizer: 第27回半導体におけるスピン工学の基礎と応用 (PASPS-27)
• [Presentation] スピントロニクス学術研究基盤と連携ネットワーク (Spin-RNJ)の活動と今後の展望 (2024)
  • Author(s): 田中 雅明
  • Organizer: 「スピントロニクス学術研究基盤と連携ネットワーク（Spin-RNJ）」シンポジウム Spin-RNJ 2023年度報告会
  • Invited
• [Presentation] Fe/MgO電極をもつGe ナノチャネルデバイスにおけるd0強磁性を利用した巨大磁気抵抗スイッチ効果 Colossal magnetoresistive switching induced by d0 ferromagnetism in a Ge-based nanochannel device with Fe/MgO electrodes (2024)
  • Author(s): 大矢忍，鶴岡駿，金田昌也，新屋ひかり，福島鉄也，武田崇仁, 但野由梨子，遠藤達朗，Le Duc Anh，真砂啓，吉田博，田中雅明
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] Bi/MnGa ヘテロ構造における界面トポロジカル状態 Interface Topological States in a Bi/MnGa Heterostructure (2024)
  • Author(s): 小林正起，N. H. D. Khang，武田崇仁, 荒木恒星, 岡野諒, 鈴木雅弘, 黒田健太, 矢治光一郎, 菅原克明, 相馬清吾, 中山耕輔, 北村未歩, 堀場弘司, 藤森淳, 佐藤宇史, 辛埴, 田中雅明, P. N. Hai
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] Spin-Charge Conversion in a Ferromagnetic Metal Fe / Topological Dirac Semimetal α-Sn Heterostructures (2024)
  • Author(s): Masayuki Ishida, Soichiro Fukuoka, Masaaki Tanaka, and Le Duc Anh
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] Topological Dirac semimetal α-Sn/ superconducting β-Sn in-plane heterostructures by laser lithography (2024)
  • Author(s): Takahiro Saeki, Keita Ishihara, Le Duc Anh, Masaaki Tanaka
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] 集束イオンビーム照射によるディラック半金属a-Sn から超伝導体b-Sn への同素体転移 Allotropic transition of Dirac semimetal α-Sn to superconductor β-Sn induced by focused ion beam irradiation (2024)
  • Author(s): 稲垣洸大,石原奎太,堀田智貴,関祐一, 武田崇仁 , 石田達拡, 大槻太毅, 川崎郁斗, 藤森伸一, 田中雅明, Le Duc Anh, 小林 正起
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] Spin-flip Mechanism in a Si Inversion Layer of Spin MOSFETs (2024)
  • Author(s): Shoichi Sato, Masaaki Tanaka, and Ryosho Nakane
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] Proposal and demonstration of spin injection/detection model based on band diagram of Si-based ferromagnetic tunnel junction (2024)
  • Author(s): 于柏森，佐藤彰一，田中雅明、中根了昌
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] 強磁性遷移金属酸化物SrRuO3 超高品質薄膜におけるRu 4d-O 2p 混成状態密度 (2024)
  • Author(s): 関祐一, 若林勇希, 武田崇仁, 稲垣洸大, 藤森伸一, 竹田幸治, 谷保芳孝, 山本秀樹, Yoshiharu Krockenberger, 藤森淳, 田中雅明, 小林正起
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] 基板上のMgO ベースの 抵抗スイッチ効果デバイスの磁場依存性と巨大なスピンバルブライク動作 (2024)
  • Author(s): 金田昌也、鶴岡 駿、遠藤達朗、但野由梨子、武田崇仁、福島鉄也、新屋ひかり、真砂啓、田中雅明、吉田博、大矢忍
  • Organizer: Spin-RNJ 2023年度報告会
• [Presentation] Observation of impurity band in (InFe)(SbBi) ferromagnetic semiconductor using infrared magnetic circular dichroism spectroscopy (2024)
  • Author(s): Kota Ejiri, Yota Endo, Kenta Takabayashi, Masaaki Tanaka, Pham Nam Hai
  • Organizer: 2024年第71回応用物理学会春季学術講演会
• [Presentation] Efficient spin-charge conversion in a ferromagnetic metal Fe / topological Dirac semimetal α-Sn heterostructure (2024)
  • Author(s): Masayuki Ishida, Soichiro Fukuoka, Masaaki Tanaka, and Le Duc Anh
  • Organizer: 2024年第71回応用物理学会春季学術講演会
• [Presentation] Epitaxial Growth of Topological Semimetal Sb (2024)
  • Author(s): Tomoki Hotta, Le Duc Anh, and Masaaki Tanaka
  • Organizer: 2024年第71回応用物理学会春季学術講演会
• [Presentation] Enhancement of double-exchange interaction in a La2/3Sr1/3MnO3 membrane released from epitaxial strain (2024)
  • Author(s): Takahito Takeda, Takuma Arai, Kohei Yamagami,Le Duc Anh, Masaaki Tanaka, Masaki Kobayashi, and Shinobu Ohya
  • Organizer: 2024年第71回応用物理学会春季学術講演会
• [Presentation] Topological Dirac semimetal α-Sn / superconducting β-Sn in-plane heterostructures fabricated by laser lithography (2024)
  • Author(s): Takahiro Saeki, Keita Ishihara, Le Duc Anh, Masaaki Tanaka
  • Organizer: 2024年第71回応用物理学会春季学術講演会
• [Presentation] A new class of ferromagnetic semiconductors and quantum heterostructures (2023)
  • Author(s): Le Duc Anh, Kosuke Takiguchi, Takahiro Chiba, and Masaaki Tanaka
  • Organizer: IEEE International Magnetics Conference (Intermag 2023)
  • Int'l Joint Research / Invited
• [Presentation] A new class of Fe-doped III-V ferromagnetic semiconductors with high Curie temperature and their quantum heterostructures (2023)
  • Author(s): Masaaki Tanaka
  • Organizer: Compound Semiconductor Week 2023 (CSW 2023)
  • Int'l Joint Research / Invited
• [Presentation] Epitaxial growth and topological transport properties in Sn-based quantum heterostructures (2023)
  • Author(s): Le Duc Anh, Keita Ishihara, Tomoki Hotta, Takahiro Chiba, Yohei Kota, and Masaaki Tanaka
  • Organizer: Superstripes 2023 Quantum Complex Matter
  • Int'l Joint Research / Invited
• [Presentation] Giant spin-to-charge conversion in two-dimensional states at high-quality all-epitaxial single-crystal-oxide interfaces/surfaces (2023)
  • Author(s): Shinobu Ohya
  • Organizer: 25th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-25) and 21st International Conference on Modulated Semiconductor Structures (MSS-21)
  • Int'l Joint Research / Invited
• [Presentation] New magnetotransport phenomena in quantum heterostructures containing an Fe-doped ferromagnetic semiconductor (2023)
  • Author(s): Le Duc Anh, Kosuke Takiguchi, Harunori Shiratani, Ryo Morikawa1, Takahiro Chiba, and Masaaki Tanaka
  • Organizer: 25th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-25) and 21st International Conference on Modulated Semiconductor Structures (MSS-21)
  • Int'l Joint Research / Invited
• [Presentation] Large nonreciprocal superconductivity in β-Sn nanowires embedded in topological Dirac semimetal α-Sn thin films (2023)
  • Author(s): Keita Ishihara, Le Duc Anh Tomoki Hotta, Kohdai Inagaki, Masaki Kobayashi, and Masaaki Tanaka
  • Organizer: 25th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-25) and 21st International Conference on Modulated Semiconductor Structures (MSS-21)
  • Int'l Joint Research
• [Presentation] Overview of Spintronics Research Network of Japan (Spin-RNJ) and Centers for Spintronics Research Network (CSRN) (2023)
  • Author(s): Masaaki Tanaka
  • Organizer: EU-Japan Workshop on Spintronics and Quantum Transformation (Spin-QX 2023)
  • Int'l Joint Research
• [Presentation] A new class of Fe-doped III-V ferromagnetic semiconductors with high Curie temperature and their quantum heterostructures (2023)
  • Author(s): Masaaki Tanaka, Le Duc Anh, Nguyen Thanh Tu, Shobhit Goel, Karumuri Sriharsha, Kosuke Takiguchi, Pham Nam Hai
  • Organizer: EU-Japan Workshop on Spintronics and Quantum Transformation (Spin-QX 2023)
  • Int'l Joint Research / Invited
• [Presentation] Developments of novel spintronics functionalities using oxide heterostructures (2023)
  • Author(s): Shinobu Ohya, Tatsuro Endo, Shun Tsuruoka, Yuriko Tadano, Shingo Kaneta-Takada, Yuichi Seki, Masaki Kobayashi, Le Duc Anh, Munetoshi Seki, Hitoshi Tabata, and Masaaki Tanaka
  • Organizer: EU-Japan Workshop on Spintronics and Quantum Transformation (Spin-QX 2023)
  • Int'l Joint Research / Invited
• [Presentation] New topological transport phenomena in Sn-based quantum heterostructures (2023)
  • Author(s): Le Duc Anh, Kengo Takase, Kosuke Takiguchi, Keita Ishihara, and Masaaki Tanaka
  • Organizer: EU-Japan Workshop on Spintronics and Quantum Transformation (Spin-QX 2023)
  • Int'l Joint Research / Invited
• [Presentation] Device physics of Si-based spin metal-oxide-semiconductor field-effect transistors (2023)
  • Author(s): Ryosho Nakane, Shoichi Sato, and Masaaki Tanaka
  • Organizer: EU-Japan Workshop on Spintronics and Quantum Transformation (Spin-QX 2023)
  • Int'l Joint Research / Invited
• [Presentation] Room-temperature spintronics using ferromagnetic semiconductor and topological insulator (2023)
  • Author(s): Pham Nam Hai, Nguyen. H. D. Khang, Nguyen Thanh Tu, Le Duc Anh and Masaaki Tanaka
  • Organizer: EU-Japan Workshop on Spintronics and Quantum Transformation (Spin-QX 2023)
  • Int'l Joint Research / Invited
• [Presentation] New Magnetotransport Phenomena in Non-magnetic/Ferromagnetic Semiconductor Quantum Heterostructures (2023)
  • Author(s): Le Duc Anh, Kosuke Takiguchi, Harunori Shiratani, Ryo Morikawa, Takahiro Chiba, and Masaaki Tanaka
  • Organizer: 6th International Conference of Asian Union of Magnetics Societies (IcAUMS 2023)
  • Int'l Joint Research / Invited
• [Presentation] Ferromagnetic semiconductor (Ga,Fe)Sb with very high Curie temperature (530 K) grown on vicinal GaAs(001) substrates (2023)
  • Author(s): Kenta Takabayashi, Masaaki Tanaka, and Pham Nam Hai
  • Organizer: 55th Solid State Devices and Materials (SSDM)
  • Int'l Joint Research
• [Presentation] A new class of Fe-doped III-V ferromagnetic semiconductors with high Curie temperature and their quantum heterostructures (2023)
  • Author(s): Masaaki Tanaka, Kosuke Takiguchi, and Le Duc Anha
  • Organizer: International Workshop on Spintronics (Spin Asia 2023)
  • Int'l Joint Research / Invited
• [Presentation] Enhancement of spin-to-charge conversion in SrRu1-xO3 films by Ru stoichiometry control (2023)
  • Author(s): Shingo Kaneta-Takada, Yuki K. Wakabayashi, Yoshitaka Taniyasu, Hideki Yamamoto, Yoshiharu Krockenberger, Hikari Shinya, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 29th International Workshop on Oxide Electronics (iWOE29)
  • Int'l Joint Research
• [Presentation] Giant spin-valve effect and FET operation in nano-channel oxide devices made using metal-insulator transition (2023)
  • Author(s): Tatsuro Endo, Shun Tsuruoka, Yuriko Tadano, Shingo Kaneta-Takada, Yuichi Seki, Masaki Kobayashi, Le Duc Anh, Munetoshi Seki, Hitoshi Tabata, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 29th International Workshop on Oxide Electronics (iWOE29)
  • Int'l Joint Research
• [Presentation] Enhancement in Magnetization and Perpendicular Magnetic Anisotropy in a La2/3Sr1/3MnO3 Thin Film Released from a SrTiO3 Substrate (2023)
  • Author(s): Takuma Arai, Shingo Kaneta-Takada, Le Duc Anh, Masaki Kobayashi, Momoko Onodera, Kei Kinoshita, Rai Moriya, Tomoki Machida, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 29th International Workshop on Oxide Electronics (iWOE29)
  • Int'l Joint Research
• [Presentation] Spin Polarization and Magnetoresistance in a Si-based Spin MOSFET (2023)
  • Author(s): Shoichi Sato, Masaaki Tanaka, Ryosho Nakane
  • Organizer: 68th Annual Conference on Magnetism and Magnetic Materials (MMM 2023)
  • Int'l Joint Research
• [Presentation] Spin injection through a Si-based ferromagnetic tunnel junction: a band diagram model (2023)
  • Author(s): Baisen Yu, Shoichi Sato, Masaaki Tanaka, and Ryosho Nakane
  • Organizer: 68th Annual Conference on Magnetism and Magnetic Materials (MMM 2023)
  • Int'l Joint Research
• [Presentation] Scattering-Dependent Transport of SrRuO3 Films: From Weyl Fermion Transport to Hump-Like Hall Effect Anomaly (2023)
  • Author(s): Shingo Kaneta-Takada, Yuki K. Wakabayashi, Yoshiharu Krockenberger, Hiroshi Irie, Shinobu Ohya, Masaaki Tanaka, Yoshitaka Taniyasu, and Hideki Yamamoto
  • Organizer: 68th Annual Conference on Magnetism and Magnetic Materials (MMM 2023)
  • Int'l Joint Research
• [Presentation] Significant Reduction of Dead Layers and Magnetic Anisotropy Change in a Strain-Free Transferred La2/3Sr1/3MnO3 Thin Film on a Si Substrate (2023)
  • Author(s): Takuma Arai, Shingo Kaneta-Takada, Le Duc Anh, Masaki Kobayashi, Momoko Onodera, Rai Moriya, Tomoki Machida, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 68th Annual Conference on Magnetism and Magnetic Materials (MMM 2023)
  • Int'l Joint Research
• [Presentation] Giant spin-valve-like behavior induced by magnetic-field-controlled resistive switching in an Fe/MgO/Ge-based two-terminal device (2023)
  • Author(s): Masaya Kaneda, Shun Tsuruoka, Tatsuro Endo, Yuriko Tadano, Tetsuya Fukushima, Hikari Shinya, Akira Masago, Masaaki Tanaka, Hiroshi Katayama-Yoshida, and Shinobu Ohya
  • Organizer: 68th Annual Conference on Magnetism and Magnetic Materials (MMM 2023)
  • Int'l Joint Research
• [Presentation] Highly Efficient Spin-Charge Conversion in a Ferromagnetic metal Fe / Topological Dirac Semimetal α-Sn Heterostructure (2023)
  • Author(s): Masayuki Ishida, Soichiro Fukuoka, Masaaki Tanaka, and Le Duc Anh
  • Organizer: Vietnamese Academic Network in Japan (VANJ) Conference (VANJ 2023)
  • Int'l Joint Research
• [Presentation] High-mobility Two-dimensional carriers from surface Fermi arcs in ferromagnetic Weyl semimetal SrRuO3 films (2023)
  • Author(s): Yuki. K. Wakabayashi, Shingo Kaneta-Takada, Yoshiharu Krockenberger, Toshihiro Nomura, Yoshimitsu Kohama, Hiroshi Irie, Kosuke Takiguchi, Shinobu Ohya, Masaaki Tanaka, Yoshitaka Taniyasu, and Hideki Yamamoto
  • Organizer: Materials Research Society (MRS) Fall Meeting
  • Int'l Joint Research
• [Presentation] Epitaxial growth and topological transport properties of Sn-based quantum heterostructures (2023)
  • Author(s): L. D. Anh, K. Ishihara, T. Hotta, D. Nishigaki, K. Inagaki, M. Kobayashi, T. Chiba, Y. Kota, and M. Tanaka
  • Organizer: International grand meeting (MRM2023/IUMRS-ICA2023)
  • Int'l Joint Research / Invited
• [Presentation] Interface States between Topological Insulator Bi and Ferromagnet MnGa Observed by Angle-Resolved Photoemission Spectroscopy (2023)
  • Author(s): Masaki Kobayashi, Nguyen H. D. Khang, Takahito Takeda, Kohsei Araki, Ryo Okano, Masahiro Suzuki, Kenta Kuroda, Koichiro Yaji, Katsuaki Sugawara, Seigo Souma, Kosuke Nakayama, Miho Kitamura, Koji Horiba, Atsushi Fujimor, Takafumi Sato, Shik Shin, Masaaki Tanaka, and Pham Nam Hai
  • Organizer: International grand meeting (MRM2023/IUMRS-ICA2023)
  • Int'l Joint Research
• [Presentation] 強相関強磁性遷移金属酸化物SrRuO3薄膜における軌道に依存したRu 4d-配位子混成状態密度の観測 (2023)
  • Author(s): 関祐一, 若林勇希, 武田崇仁, 稲垣洸大, 藤森伸一, 竹田幸治, 谷保芳孝, 山本秀樹, Yoshiharu Krockenberger, 藤森淳, 田中雅明, 小林正起
  • Organizer: 日本物理学会第78回年次大会
• [Presentation] 集束イオンビーム照射によるディラック半金属α-Snの超伝導体 β-Snへの同素体転移 (2023)
  • Author(s): 稲垣 洸大, 石原 奎太, 堀田 智貴, 関 祐一, 武田 崇仁, 石田 達弘, 大槻 太殻, 川崎 郁人, 藤森 伸一, 田中 雅明, Le Duc Anh, 小林 正起
  • Organizer: 日本物理学会第78回年次大会
• [Presentation] New superconducting phenomena in Sn-based quantum structures (2023)
  • Author(s): Le Duc Anh, Keita Ishihara1, Tomoki Hotta, Daiki Nishigaki, and Masaaki Tanaka
  • Organizer: 2023年第84回応用物理学会秋季学術講演会, シンポジウム「磁性・スピンと超伝導が織りなす新物理現象とデバイス応用」
  • Invited
• [Presentation] Magnetic-field and current-direction dependence of the superconducting diode effect in superconductor Sn wires embedded in a Dirac semimetal thin film (2023)
  • Author(s): Keita Ishihara, Le Duc Anh, Tomoki Hotta, and Masaaki Tanaka
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Influence of the Ru composition change on the spin-to-charge conversion in SrRu1-xO3 films (2023)
  • Author(s): Shingo Kaneta-Takada, Yuki K. Wakabayashi, Yoshitaka Taniyasu, Hideki Yamamoto, Yoshiharu Krockenberger, Hikari Shinya, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Scattering-dependent transport of SrRuO3 films: From Weyl fermion transport to hump-like Hall effect anomaly (2023)
  • Author(s): Shingo Kaneta-Takada, Yuki K. Wakabayashi, Yoshiharu Krockenberger, Hiroshi Irie1, Shinobu Ohya, Masaaki Tanaka, Yoshitaka Taniyasu, and Hideki Yamamoto
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Superconductivity in an α-Sn thin film (2023)
  • Author(s): Tomoki Hotta, Le Duc Anh, and Masaaki Tanaka
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Field-free spin-orbit torque magnetization switching in a perpendicularly magnetized (Ga,Mn)As single layer (2023)
  • Author(s): Xinyuan Yang, Chenda Wang, Miao Jiang, Shinobu Ohya, and Masaaki Tanaka
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Single-layer spin-orbit torque magnetization switching in high-quality ferromagnetic Weyl semimetal SrRuO3 (2023)
  • Author(s): Hiroto Horiuchi, Yuki K. Wakabayashi, Shingo Kaneta-Takada, Yoshitaka Taniyasu, Hideki Yamamoto, Yoshiharu Krockenberger, Masaaki Tanaka, and Shinobu Ohya
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Observation of high-mobility quantum transport and topological band structure of α-Sn / Fe heterostructures (2023)
  • Author(s): Soichiro Fukuoka, Tomoki Hotta, Le Duc Anh, Takahiro Chiba, Yohei Kota, and Masaaki Tanaka
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] 強相関強磁性遷移金属酸化物SrRuO3における軌道依存Ru 4d-O 2p混成状態密度 (2023)
  • Author(s): 関祐一, 若林勇希, 武田崇仁, 稲垣洸大, 藤森伸一, 竹田幸治, 谷保芳孝, 山本秀樹, Yoshiharu Krockenberger, 藤森淳, 田中雅明, 小林 正起
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] 集束イオンビーム照射によるディラック半金属α-Snの超伝導体β-Snへの同素体転移 (2023)
  • Author(s): 稲垣洸大, 石原奎太, 堀田智貴, 関祐一, 武田崇仁, 石田達拡, 大槻太毅, 川崎郁斗, 藤森伸一, 田中雅明, Le Duc Anh, 小林正起
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Epitaxial growth and characterization of superconductor Al / ferromagnetic semiconductor (In,Fe)As heterostructures on InP substrates (2023)
  • Author(s): Hirotaka Hara, Keita Ishihara, Le Duc Anh, and Masaaki Tanaka
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Very high Curie temperature (530 K) in ferromagnetic semiconductor (Ga,Fe)Sb grown on vicinal GaAs(001) substrates (2023)
  • Author(s): Kenta Takabayashi, Masaaki Tanaka, and Pham Nam Hai
  • Organizer: 2023年第84回応用物理学会秋季学術講演会
• [Presentation] Ru組成の異なるSrRuO3およびSrRu0.7O3薄膜におけるスピン流-電流変換効率の比較 (Comparison of the spin-to-charge conversion efficiencies between SrRuO3 and SrRu0.7O3 thin films) (2023)
  • Author(s): 金田真悟、若林勇希、新屋ひかり、谷保芳孝、山本秀樹、ヨシハルクロッケンバーガー、田中雅明、大矢忍
  • Organizer: 強的秩序とその操作に関わる 第17回 夏の学校 ＆ 学術変革B 超軌道分裂による新奇巨大界面応答 キックオフシンポジウム
• [Presentation] MgOベースの抵抗スイッチ効果デバイスにみられる巨大なスピンバルブライク動作 (Giant spin-valve-like behaver in a MgO based resistive switching device (2023)
  • Author(s): 金田昌也、鶴岡駿、遠藤達朗、但野由梨子、武田崇仁、福島鉄也、新屋ひかり、真砂啓、田中雅明、吉田博、大矢忍
  • Organizer: 強的秩序とその操作に関わる 第17回 夏の学校 ＆ 学術変革B 超軌道分裂による新奇巨大界面応答 キックオフシンポジウム
• [Remarks] 田中・大矢・中根・アイン研究室
  • URL: http://www.cryst.t.u-tokyo.ac.jp/
• [Remarks] スピントロニクス学術連携研究教育センター(CSRN)
  • URL: http://www.csrn.t.u-tokyo.ac.jp/
• [Remarks] スピントロニクス学術研究基盤と連携ネットワーク拠点(Spin-RNJ)
  • URL: http://www.csrn.t.u-tokyo.ac.jp/outline_en/