Search for novel electron spin filter using spin-polarized surface states

• Project/Area Number: 26887024
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics I
• Research Institution: Osaka University
• Principal Investigator: OHTSUBO Yoshiyuki 大阪大学, 生命機能研究科, 助教 (70735589)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: スピントロニクス / 表面電子状態 / 電子線スピンフィルタ / スピンフィルタ / スピン軌道相互作用 / スピン・角度分解光電子分光

Outline of Final Research Achievements

We are interested in the spin-filtering functionality of electron beam, which is a typical example of spintronics application using both of two character of electrons (charge and spin). For this study, we have (i) established the experimental method how to observe the spin-filtering functionality of electron beam and (ii) searched for the novel candidate of such electron-beam spin filter with hich efficiency and long lifetime. We used a conventional electron gun and Mott-type spin detector and demonstrated that the combination of these components can directly detect the spin-selective electron scattering. We also found some new surface atomic structures on the InSb(001) surface covered with Bi, showing one-dimensional (1D) surface atomic structure. One of the 1D Bi/InSb(001) surface holds the surface state with large spin polarization and its possible application to future spintronics is expected.

Research Products

• [Int'l Joint Research] Synchrotron SOLEIL/Univ. Paris-Sud/Universite Francois Rabelais de Tours(フランス)
• [Journal Article] Spin to Charge Conversion at Room Temperature by Spin Pumping into a New Type of Topological Insulator: α-Sn Films (2016)
  • Author(s): J-C Rojas-Sanchez, S Oyarzun, Y Fu, A Marty, C Vergnaud, S Gambarelli, L Vila, M Jamet, Y Ohtsubo, A Taleb-Ibrahimi, P Le Fevre, F Bertran, N Reyren, J-M George, A Fert
  • Journal Title: Physical Review Letters Volume: 116 Issue: 9
  • DOI: 10.1103/physrevlett.116.096602
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Large modification in insulator-metal transition of VO2 films grown on Al2O3 (001) by high energy ion irradiation in biased reactive sputtering (2016)
  • Author(s): Nurul Hanis Azhan, Kunio Okimura, Yoshiyuki Ohtsubo, Shin-ichi Kimura, Mustapha Zaghrioui, and Joe Sakai
  • Journal Title: Journal of Applied Physics Volume: 119 Issue: 5
  • DOI: 10.1063/1.4941348
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Surface Tomonaga-Luttinger-liquid state on Bi/InSb(001) (2015)
  • Author(s): Y. Ohtsubo, J. Kishi, K. Hagiwara, P. L. Fevre, F. Bertran, A. T. Ibrahimi, H. Yamane, S. Ideta, M. Matsunami, K. Tanaka, and S. Kimura
  • Journal Title: Physical Review Letters Volume: 115 Issue: 25
  • DOI: 10.1103/physrevlett.115.256404
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Hierarchical spin-orbital polarization of a giant Rashba system (2015)
  • Author(s): Lewis Bawden, Jonathan M Riley, Choong H Kim, Raman Sankar, Eric J Monkman, Daniel E Shai, Haofei I Wei, Edward B Lochocki, Justin W Wells, Worawat Meevasana, Timur K Kim, Moritz Hoesch, Yoshiyuki Ohtsubo, Patrick Le Fevre, Craig J Fennie, Kyle M Shen, Fangcheng Chou, Phil DC King
  • Journal Title: Science Advances Volume: 1 Issue: 8
  • DOI: 10.1126/sciadv.1500495
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Topological phase diagram and saddle point singularity in a tunable topological crystalline insulator (2015)
  • Author(s): Madhab Neupane, Su-Yang Xu, R Sankar, Q Gibson, YJ Wang, I Belopolski, N Alidoust, G Bian, PP Shibayev, DS Sanchez, Y Ohtsubo, A Taleb-Ibrahimi, S Basak, W-F Tsai, H Lin, Tomasz Durakiewicz, RJ Cava, A Bansil, FC Chou, M Zahid Hasan
  • Journal Title: Physical Review B Volume: 92 Issue: 7
  • DOI: 10.1103/physrevb.92.075131
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental evidence for two-dimensional states localized in subsurface region of Ge(111) (2015)
  • Author(s): K. Yaji, Y. Ohtsubo, S. Hatta, H. Okuyama, R. Yukawa, I. Matsuda, P. Le Fevre, F. Bertran, A. Taleb-Ibrahimi, A. Kakizaki, T. Aruga
  • Journal Title: J. Electron Spectros. Relat. Phenom Volume: 201 Pages: 92-97
  • DOI: 10.1016/j.elspec.2014.09.005
  • Peer Reviewed
• [Journal Article] New aspects of electronic excitations at the bismuth surface: Topology, thermalizatoin and coupling to coherent phonons (2014)
  • Author(s): L. Perfetti, J. Faure, E. Papalazarou, J. Mauchain, M. Marsi, M.O. Goerbig, A. Taleb-Ibrahimi, Y. Ohtsubo
  • Journal Title: Journal of Electron Spectroscopy and Related Phenomena Volume: - Pages: 60-65
  • DOI: 10.1016/j.elspec.2014.12.004
  • Peer Reviewed
• [Presentation] InSb(001)基板上に作製したBi薄膜の1次元的な表面電子状態 (2016)
  • Author(s): 岸潤一郎, 大坪嘉之, 萩原健太, 木村真一
  • Organizer: 日本物理学会 第７１回年会
  • Place of Presentation: 東北学院大（宮城県 仙台市)
  • Year and Date: 2016-03-19
• [Presentation] 近藤絶縁体YbB12(001)表面の角度分解光電子分光 (2016)
  • Author(s): 萩原健太, 大坪嘉之，岸潤一郎，松波雅治， 田中清尚， 伊藤孝寛，宮崎秀俊，伊賀文俊，J. Rault，P. Le Fevre， F. Bertran， A. Taleb-Ibrahimi，木村真一
  • Organizer: 第２９回日本放射光学会年会 放射光科学合同シンポジウム
  • Place of Presentation: 東大物性研柏の葉キャンパス（千葉県 柏市)
  • Year and Date: 2016-01-09
• [Presentation] 近藤絶縁体YbB12(001)表面の角度分解光電子分光 (2015)
  • Author(s): 萩原健太, 岸潤一郎, 大坪嘉之, 松波雅治, 田中清尚, 伊藤孝寛, 宮崎秀俊, 伊賀文俊, 木村真一
  • Organizer: 日本物理学会 ２０１５年秋季大会
  • Place of Presentation: 関西大学（大阪府 吹田市)
  • Year and Date: 2015-09-18
• [Presentation] Bi被覆InSb(001)上の1次元金属的電子状態と表面原子構造 (2015)
  • Author(s): 大坪嘉之, 岸潤一郎, 萩原健太, Patrick Le Fevre, Francois Bertran, Amina Taleb-Ibrahimi, 松波雅治, 田中清尚, 木村真一
  • Organizer: 日本物理学会 ２０１５年秋季大会
  • Place of Presentation: 関西大学（大阪府 吹田市)
  • Year and Date: 2015-09-16
• [Presentation] Surface states of elemental topological materials: alpha tin and bismuth (2015)
  • Author(s): Yoshiyuki Ohtsubo
  • Organizer: SOCSIS (Spin-Orbit Coupling in Surface or Interface States) 2015
  • Place of Presentation: Spetses (Greece)
  • Year and Date: 2015-06-08
  • Int'l Joint Research / Invited
• [Presentation] 表面一次元原子鎖Au/Ge(001)の二次元電子状態 (2015)
  • Author(s): 矢治光一郎，湯川龍，金聖憲，大坪嘉之，P. Le Fevre，F. Bertran，A. Taleb-Ibrahimi，松田巌，中辻寛，小森文夫
  • Organizer: 日本物理学会第７０回年次大会
  • Place of Presentation: 早稲田大学（東京都）
  • Year and Date: 2015-03-24
• [Presentation] Bi/InSb(001)-c(2×6)表面における1次元金属的電子状態 (2015)
  • Author(s): 大坪嘉之，岸潤一郎，萩原健太，P. Le Fevre，F. Bertran，A. Taleb-Ibrahimi，松波雅治，田中清尚，木村真一
  • Organizer: 日本物理学会第７０回年次大会
  • Place of Presentation: 早稲田大学（東京都）
  • Year and Date: 2015-03-21
• [Presentation] Bi単結晶のトポロジカル表面状態 (2015)
  • Author(s): 大坪 嘉之, L. Perfetti, M.O. Goerbig, P. Le Fevre, F. Bertran, A. Taleb-Ibrahimi
  • Organizer: 日本放射光学会年会 放射光科学合同シンポジウム
  • Place of Presentation: 立命館大学（滋賀県）
  • Year and Date: 2015-01-11
• [Presentation] 単元素トポロジカル物質の表面電子状態 (2014)
  • Author(s): 大坪 嘉之
  • Organizer: 日本物理学会２０１４年秋季大会
  • Place of Presentation: 中部大学（愛知県）
  • Year and Date: 2014-09-08
  • Invited
• [Remarks] 1次元での電子の振る舞いを固体表面で実証
  • URL: http://resou.osaka-u.ac.jp/ja/research/2015/20151202_2