Electron spin control of photo-induced spin current probed by spin-ARPES usign laser source

• Project/Area Number: 18H01954
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Hiroshima University
• Principal Investigator: Koji Miyamoto 広島大学, 放射光科学研究センター, 准教授 (50508067)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000); Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
• Keywords: スピントロニクス / スピン軌道相互作用 / 光スピン電流 / スピン分解光電子分光 / 光誘起スピン電流 / オプトスピントロニクス / スピン角度分解光電子分光法 / スピン / スピン角度分解光電子分光 / 光誘起電気伝導 / 光スピントロニクス / 光誘起 / 光誘起スピン偏極電流

Outline of Final Research Achievements

The goal of this research is spin control and spin polarization of photo-induced spin polarized current in relation with the incident angle and polarization dependence of light The purpose is to clarify the spin direction and polarization of polar currents using spin-resolved photoelectron spectroscopy, from the one-to-one correspondence between photoelectrons and holes (source of photo-induced spin polarization current) generated by photoexcitation. We have developed a device that can simultaneously measure photoinduced current and spin-resolved photoelectron spectroscopy with extremely low temperatures. Although it was necessary to repair the laser, it was difficult to obtain the final result because it was not possible to repair it due to the influence of the corona virus because it was an overseas manufacturer.
However, we studied the relationship between photoexcitation energy and induced photoelectrons using a synchrotron radiation source, and obtained new findings.

Academic Significance and Societal Importance of the Research Achievements

本研究は、膨大な情報のやり取りを可能にするために、今後必要不可欠となる光とスピントロニクス物質の相互作用についての研究である。特に、誘起されるスピン電流のスピン方位及び偏極度の大きさのコントロールが可能になれば、光輸送による情報量の取得に大きなアドバンテージを設けることができ、取得できる情報量を増大させることも可能であるため、その波及効果や社会的意義は大きい。一方、極低温で且つ電気伝導やスピン電子構造を観測できる装置は世界的に見ても無く、別研究での需要も見込めるため基礎研究の観点でも波及効果は大きいと考える。

Research Products

• [Journal Article] Spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic Heusler films (2020)
  • Author(s): Sumida Kazuki、Sakuraba Yuya、Masuda Keisuke、Kono Takashi、Kakoki Masaaki、Goto Kazuki、Zhou Weinan、Miyamoto Koji、Miura Yoshio、Okuda Taichi、Kimura Akio
  • Journal Title: Communications Materials Volume: 1 Issue: 1
  • DOI: 10.1038/s43246-020-00088-w
  • Peer Reviewed / Open Access
• [Journal Article] Experimental verification of temperature induced topological phase transition on TlBiS2 and TlBiSe2 (2020)
  • Author(s): Takehito Imai , Jiahua Chen, Kazuki Kato, Kenta Kuroda, Teruo Matsuda, Akio Kimura, Koji Miyamoto, Sergey V. Eremeev, and Taichi Okuda
  • Journal Title: Physical Review B Volume: 102 Issue: 12 Pages: 125151-125151
  • DOI: 10.1103/physrevb.102.125151
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Enhanced surface state protection and band gap in the topological insulator PbBi4Te4S3 (2018)
  • Author(s): K. Sumida, T. Natsumeda, K. Miyamoto, I. V. Silkin, K. Kuroda, K. Shirai, S. Zhu, K. Taguchi, M. Arita, J. Fujii, A. Varykhalov, O. Rader, V. A. Golyashov, K. A. Kokh, O. E. Tereshchenko, E. V. Chulkov, T. Okuda, and A. Kimura
  • Journal Title: PHYSICAL REVIEW MATERIALS Volume: 2 Issue: 10 Pages: 104201-104201
  • DOI: 10.1103/physrevmaterials.2.104201
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Circular-polarized-light-induced spin polarization characterized for the Dirac-cone surface state at W(110) with C2v symmetry (2018)
  • Author(s): K. Miyamoto, H. Wortelen, T. Okuda, J. Henk and M. Donath
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 10440-10440
  • DOI: 10.1038/s41598-018-28693-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Retrieving the initial-state spin polarization from spin-resolved photoemission: Proposal for a case study on W(110) (2018)
  • Author(s): Juergen Henk, Koji Miyamoto, and Markus Donath
  • Journal Title: Physical Review B Volume: 98 Issue: 4 Pages: 045124-045124
  • DOI: 10.1103/physrevb.98.045124
  • Peer Reviewed / Int'l Joint Research