spin physics of topological insulators

• Project/Area Number: 23740236
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: YOKOYAMA Takehito 東京工業大学, 理工学研究科, 助教 (30578216)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: トポロジカル絶縁体

Outline of Final Research Achievements

Topological insulators are new states of matter where the surface electrons obey the Dirac equation at low energy. The spin and momentum of the Dirac fermions are locked, and hence with topological insulators, one can expect interesting spintronics effects. I have investigated spin related phenomena in topological insulators with ferromagnets attached and clarified the relation between the magnetization and surface transports.

Research Products

• [Journal Article] Anomalous interference in Aharonov-Bohm rings with two Majorana bound states (2014)
  • Author(s): Akiko Ueda and Takehito Yokoyama
  • Journal Title: Physical Review B Volume: 90 Issue: 8 Pages: 081405-081405
  • DOI: 10.1103/physrevb.90.081405
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Spin and valley transports in junctions of Dirac fermions (2014)
  • Author(s): Takehito Yokoyama
  • Journal Title: New Journal of Physics Volume: 16 Issue: 8 Pages: 085005-085005
  • DOI: 10.1088/1367-2630/16/8/085005
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Conductance and Fano factor in normal/ferromagnetic/normal bilayer graphene junction (2014)
  • Author(s): Z. Rashidian, F. M. Mojarabian, P. Bayati, G. Rashedi, A. Ueda and T. Yokoyama
  • Journal Title: Journal of Physics: Condensed Matter Volume: 26 Issue: 25 Pages: 255302-255302
  • DOI: 10.1088/0953-8984/26/25/255302
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Superconducting proximity effect in silicene: Spin-valley-polarized Andreev reflection, nonlocal transport, and supercurrent (2014)
  • Author(s): J. Linder and T. Yokoyama
  • Journal Title: Phys. Rev. B Volume: 89 Issue: 2
  • DOI: 10.1103/physrevb.89.020504
  • Peer Reviewed
• [Journal Article] Giant magnetoresistance in the junction of two ferromagnets on the surface of diffusive to Dological insulators (2014)
  • Author(s): Katsuhisa Taguchi, Takehito Yokoyama, and Yukio Tanaka
  • Journal Title: Physical Review B Volume: 89 Issue: 8 Pages: 85407-85412
  • DOI: 10.1103/physrevb.89.085407
  • Peer Reviewed
• [Journal Article] Controllable valley and spin transport in ferromagnetic silicene junctions (2013)
  • Author(s): T. Yokoyama
  • Journal Title: Phys. Rev. B Volume: 87 Issue: 24
  • DOI: 10.1103/physrevb.87.241409
  • Peer Reviewed
• [Journal Article] Spin diffusion and magnetoresistance in ferromagnet/topological-insulator junctions (2013)
  • Author(s): T. Yokoyama and Y. Tserkovnyak
  • Journal Title: Phys. Rev. B Volume: 89 Issue: 3
  • DOI: 10.1103/physrevb.89.035408
  • Peer Reviewed
• [Journal Article] Spin-current absorption by inhomogeneous spin-orbit coupling (2012)
  • Author(s): K. Tsutsui, K. Hosono, and T. Yokoyama
  • Journal Title: Phys. Rev. B Volume: 86 Issue: 15 Pages: 155210-155210
  • DOI: 10.1103/physrevb.86.155210
  • Peer Reviewed
• [Journal Article] Josephson and proximity effects on the surface of a topological insulator (2012)
  • Author(s): T. Yokoyama
  • Journal Title: Phys. Rev. B Volume: 86 Issue: 7
  • DOI: 10.1103/physrevb.86.075410
  • Peer Reviewed
• [Journal Article] Topological charge pumping effect by the magnetization dynamics on the surface of three-dimensional topological insulators (2012)
  • Author(s): Hiroaki T.Ueda, Akihito Takeuchi, Gen Tatara, Takehito Yokoyama
  • Journal Title: Physical Review B Volume: VOL.85 Issue: 11
  • DOI: 10.1103/physrevb.85.115110
  • Peer Reviewed
• [Journal Article] Anomalous Meissner Effect in a Normal-Metal-Superconductor Junction with a Spin-Active Interface (2011)
  • Author(s): T. Yokoyama, Y. Tanaka and N. Nagaosa
  • Journal Title: Phys. Rev. Lett. Volume: 106 Issue: 24 Pages: 1-4
  • DOI: 10.1103/physrevlett.106.246601
  • Peer Reviewed
• [Journal Article] Current-induced magnetization reversal on the surface of a topological insulator (2011)
  • Author(s): T.Yokoyama
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 11
  • DOI: 10.1103/physrevb.84.113407
  • Peer Reviewed
• [Journal Article] Topology of Andreev bound states with flat dispersion (2011)
  • Author(s): M.Sato, Y.Tanaka, K.Yada, T.Yokoyama
  • Journal Title: Physical Review B Volume: 83 Issue: 22
  • DOI: 10.1103/physrevb.83.224511
  • Peer Reviewed
• [Journal Article] Evaluation of spin polarization in p-In0.96Mn0.04As using Andreev reflection spectroscopy including inverse proximity effect (2011)
  • Author(s): T.Akazaki, T.Yokoyama, Y.Tanaka, H.Munekata, H.Takayanagi
  • Journal Title: Phys.Rev.B Volume: 83 Issue: 15
  • DOI: 10.1103/physrevb.83.155212
  • Peer Reviewed
• [Journal Article] Charge pumping due to triplet vector chirality in ferromagnet/triplet superconductor junctions (2011)
  • Author(s): T.Yokoyama
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 13
  • DOI: 10.1103/physrevb.84.132504
  • Peer Reviewed
• [Journal Article] Spin Current in Generic Hybrid Structures due to Interfacial Spin-Orbit Scattering (2011)
  • Author(s): J.Linder, T.Yokoyama
  • Journal Title: Phys.Rev.Lett Volume: 106 Issue: 23
  • DOI: 10.1103/physrevlett.106.237201
  • Peer Reviewed
• [Journal Article] Transport properties in ferromagnetic Josephson junctions between triplet superconductors (2011)
  • Author(s): Y Rahnavard, G Rashedi, T Yokoyama
  • Journal Title: J.Phys. : Condens.Matter Volume: 23 Issue: 27 Pages: 275702-275702
  • DOI: 10.1088/0953-8984/23/27/275702
  • Peer Reviewed
• [Journal Article] Electromagnetic spin polarization on the surface of topological insulator (2011)
  • Author(s): T.Misawa, T.Yokoyama, S.Murakami
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 16
  • DOI: 10.1103/physrevb.84.165407
  • Peer Reviewed
• [Presentation] Spintronics with topological insulators (2014)
  • Author(s): T. Yokoyama
  • Organizer: Topological Aspects of Quantum Matter
  • Place of Presentation: Hsinchu, Taiwan
  • Year and Date: 2014-12-11
  • Invited
• [Presentation] Odd-frequency pairing in F/S junction (2014)
  • Author(s): T. Yokoyama
  • Organizer: 日本物理学会
  • Place of Presentation: 中部大学
  • Year and Date: 2014-09-07
  • Invited
• [Presentation] Spin and valley transports in Dirac systems: graphene, topological insulators, and silicene (2013)
  • Author(s): T. Yokoyama
  • Organizer: 9th International Workshop on Nanomagnetism and Superconductivity at the Nanoscale
  • Place of Presentation: Coma-ruga, Spain
  • Invited
• [Presentation] Odd frequency pairing in superconducting junctions (2013)
  • Author(s): T. Yokoyama
  • Organizer: International Workshop for Young Researchers on Topological Quantum Phenomena in Condensed Matter with Broken Symmetries
  • Place of Presentation: Okinawa
  • Invited
• [Presentation] 強磁性体／トポロジカル絶縁体接合におけるスピン拡散 (2013)
  • Author(s): 横山毅人
  • Organizer: 日本物理学会 2013年秋季大会
  • Place of Presentation: 徳島大学
• [Presentation] 強磁性シリセン接合におけるバレー・スピン輸送 (2013)
  • Author(s): 横山毅人
  • Organizer: 日本物理学会 2013年秋季大会
  • Place of Presentation: 徳島大学
• [Presentation] 強磁性体/超伝導体接合における近接効果 (2011)
  • Author(s): 横山毅人
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学（富山）
• [Presentation] Odd frequency superconductivity in symmetry breaking systems (2011)
  • Author(s): 横山毅人
  • Organizer: International Workshop for Young Researchers on Topological Quantum Phenomena in Condensed Matter with Broken Symmetries(招待講演)
  • Place of Presentation: ラフォーレ琵琶湖（滋賀）
• [Presentation] 強磁性体／超伝導体接合における奇周波数ペア (2011)
  • Author(s): 横山毅人
  • Organizer: 文部科学省科学研究費補助金 新学術領域研究「対称性の破れた凝縮系におけるトポロジカル量子現象」第２回領域研究会
  • Place of Presentation: 岡山大学（岡山）
• [Presentation] 強磁性体/超伝導体接合における近接効果の理論 (2011)
  • Author(s): 横山毅人
  • Organizer: 文科省 新学術領域「トポロジカル量子現象」第7回集中連携研究会
  • Place of Presentation: 名古屋大学（名古屋）
• [Presentation] トポロジカル絶縁体表面におけるジョセフソン効果と近接効果
  • Author(s): 横山毅人
  • Organizer: 日本物理学会 2012年秋季大会
  • Place of Presentation: 横浜国立大（神奈川県）
• [Presentation] トポロジカル絶縁体表面における磁気的熱輸送
  • Author(s): 横山毅人
  • Organizer: 日本物理学会 2012年秋季大会
  • Place of Presentation: 横浜国立大（神奈川県）
• [Presentation] スピン活性な界面を持つ金属/超伝導体接合における異常なマイスナー効果
  • Author(s): 横山毅人
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 広島大学(広島県)
• [Presentation] Spintronics with topological insulators and triplet superconductors
  • Author(s): 横山毅人
  • Organizer: IAS Asia Pacific Workshop on Condensed Matter Physics
  • Place of Presentation: The Hong Kong University of Science and Technology(Hong Kong)
  • Invited
• [Presentation] Spintronics using topological insulators and triplet superconductors
  • Author(s): 横山毅人
  • Organizer: The 8th International Workshop on Nanomagnetism and Superconductivity
  • Place of Presentation: Coma-ruga(Spain)
  • Invited
• [Book] Spin Current (2012)
  • Author(s): S. Murakami and T. Yokoyama
  • Total Pages: 464
  • Publisher: Oxford University Press
• [Remarks]
  • URL: http://www.stat.phys.titech.ac.jp/~yokoyama/papers.html