Improvement of high efficiency spin-resolved photoelectron spectroscopy and 3-dimensional spin analysis of materials for spintronics

2013 Fiscal Year Final Research Report

• Project/Area Number: 23244066
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Hiroshima University
• Principal Investigator: OKUDA Taichi 広島大学, 放射光科学研究センター, 准教授 (80313120)
• Co-Investigator(Renkei-kenkyūsha): KIMURA Akio 広島大学, 大学院理学研究科, 准教授 (00272534) ; MIYAMOTO Koji 広島大学, 放射光科学研究センター, 助教 (50508067)
• Project Period (FY): 2011-05-31 – 2014-03-31
• Keywords: スピントロニクス / スピン分解光電子分光 / スピン軌道相互作用 / 装置開発 / トポロジカル絶縁体 / ラシュバ分裂

Research Abstract

Spin freedom is one of the most important aspect of electrons. Magnetic properties of materials and a new spin related phenomena caused by spin-orbit interaction can be understood by investigating the energy, momentum and spin of electron in solids.
To investigate electron spin one needs spin detector. Most popular spin detector is so-called Mott detector that is used all over the world so far. However, the efficiency of spin detection is very low. Recently we have developed a new spin detector called VLEED spin detector that has 100 times higher efficiency than the Mott detector. In this study we utilised two VLEED detectors and enabled to investigate the direction of spin vector as well as its spin polarization. Because of the high efficiency, 10 (5) times higher energy (angular) resolution in spin-resolved photoemission has been realised. This study opens a pathway to investigate spin properties of materials for the next generation spintronics devices very precisely.

Research Products

• [Journal Article] Photoelectron spin-polarization-control in the topological insulator Bi2Se3 (2014)
  • Author(s): Z.-H. Zhu, C. N. Veenstra, S. Zhdanovich, M. P. Schneider, T. Okuda, K. Miyamoto, S.-Y. Zhu, H. Namatame, M. Taniguchi, M. W. Haverkort, I. S. Elfimov, and A. Damascelli
  • Journal Title: Phys. Rev. Lett Volume: 112 Pages: 076802
  • DOI: 10.1103/PhysRevLett.112.076802
  • Peer Reviewed
• [Journal Article] Experimental Evidence of Hidden Topological Surface States at the Interface of PbBi4Te7 (2013)
  • Author(s): T. Okuda, T. Maegawa, M. Ye, K. Shirai, T. Warashina, K. Miyamoto, K. Kuroda, M. Arita, Z.S. Aliev, I. R. Amiraslnov, M. B. Mabanly, E .V. Chulkov, S. V. Eremeev, A. Kimura, H. Namatame, and M. Taniguchi
  • Journal Title: Phys. Rev. Lett Volume: 111 Pages: 206803
  • DOI: 10.1103/PhysRevLett.111.206803
  • Peer Reviewed
• [Journal Article] Spin and Angle-Resolved Photoemission of Strongly Spin-Orbit Coupled Systems (2013)
  • Author(s): T. Okuda and A. Kimura
  • Journal Title: J. Phys. Soc. Jpn Volume: 82 Pages: 021002
  • DOI: 10.7566/JPSJ.82.021002
  • Peer Reviewed
• [Journal Article] Observation of a highly spin-polarized topological surface state in GeBi2Te4 (2012)
  • Author(s): K. Okamoto, K. Kuroda, H. Miyahara, K. Miyamoto, T. Okuda, Z. S. Aliev, M. B. Badanly, I. R. Amiraslanov, K. Shimada, H. Namatame, M. Taniguchi, D. A. Samorokov, T. V. Menshchikova, E. V. Chulkov, and A. Kimura
  • Journal Title: Phys. Rev. B Volume: 86 Pages: 195304
  • DOI: 10.1103/PhysRevB.86.195304
  • Peer Reviewed
• [Journal Article] Topological surface states with persistent high-spin polarization across the Dirac point in Bi_2Te_2Se and Bi2_Se_2Te (2012)
  • Author(s): K. Miyamoto, A. Kimura, T. Okuda, H. Miyahara, K. Kuroda, H. Namatame, M. Taniguchi, S. V. Eremeev, T. V. Menshchikova, E. V. Chulkov, K. A. Koch, and O. E. Tereschenko
  • Journal Title: Phys. Rev. Lett Volume: 109 Pages: 166802
  • DOI: 10.1103/PhysRevLett.109.166802
  • Peer Reviewed
• [Journal Article] Giant Rashba-type spin-splitting in bulk BiTeI (2011)
  • Author(s): K. Ishizaka, M. S. Bahramy, H. Murakawa, M. Sakano, T. Shimojima, T. Sonobe, K. Koizumi, S. Shin, H. Miyahara, A. Kimura, K. Miyamoto, T. Okuda, H. Namatame, M. Taniguchi, R. Arita, N. Nagaosa, K. Kobayashi, Y. Murakami, R. Kumai, Y. Kaneko, Y. Onose, and Y. Tokura
  • Journal Title: Nature Materials Volume: 10 Pages: 521
  • DOI: 10.1038/nmat3051
  • Peer Reviewed
• [Journal Article] Efficient SPin REsolved SpectroScopy Observation (ESPRESSO) machine at Hiroshima Synchrotron Radiation Center (2011)
  • Author(s): T. Okuda, K. Miyamoto, H. Miyahara, K. Kuroda, A. Kimura, H. Namatame, and M. Taniguchi
  • Journal Title: Rev. Sci. Instrum Volume: 82 Pages: 103302
  • DOI: 10.1063/1.3648102
  • Peer Reviewed
• [Presentation] スピン分解光電子分光を用いたディラック電子系の研究 (2014)
  • Author(s): 宮本幸治
  • Organizer: 日本物理学会第69回年会
  • Place of Presentation: 東海大学湘南キャンパス
  • Year and Date: 20140327-30
  • Invited
• [Presentation] スピン分解光電子分光を用いたディラック電子系の先駆的研究 (2014)
  • Author(s): 宮本幸治
  • Organizer: 第27回日本放射光学会年会
  • Place of Presentation: 広島国際会議場.
  • Year and Date: 20140111-13
  • Invited
• [Presentation] Ge 系トポロジカル絶縁体新物質・多層膜 (2013)
  • Author(s): 木村昭夫
  • Organizer: 日本物理学会2013秋季大会
  • Place of Presentation: 徳島大学
  • Year and Date: 20130925-28
  • Invited
• [Presentation] Observation of spin-polarized surface states induced by spin-orbit interaction by high-resolution spin-polarized photoelectron spectroscopy (2013)
  • Author(s): T. Okuda
  • Organizer: International workshop on Strong correlations and angle-resolved photoemission spectroscopy (CORPES13)
  • Place of Presentation: Hamburg, Germany
  • Year and Date: 20130729-0802
  • Invited
• [Presentation] Exploring of Spin-polarized Surface States by Highly-Efficient Spin-Polarized Photoelectron Spectroscopy (2013)
  • Author(s): T. Okuda
  • Organizer: The fall meeting of Korean Physical Society
  • Place of Presentation: Changwon city, Korea
  • Year and Date: 2013-10-31
  • Invited
• [Presentation] Spin-resolved Photoemission (2011)
  • Author(s): T. Okuda
  • Organizer: 7^<th> Surface Nano-Science Workshop
  • Place of Presentation: Muju, Korea
  • Year and Date: 20110119-21
  • Invited
• [Book] 「問題と解説で学ぶ表面科学」日本表面科学会編 (2013)
  • Author(s): 松井文彦 (編集幹事)
  • Total Pages: 193
  • Publisher: 共立出版
• [Remarks] 外界から保護されたスピン流を持つトポロジカル絶縁体の発見
  • URL: http://www.hsrc.hiroshima-u.ac.jp/result/spin4.htm