Rashba-type spin-orbit interaction in quasi-liquid layers on heavy-element crystal surfaces
Project/Area Number |
17K18757
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics and related fields
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Research Institution | Osaka University |
Principal Investigator |
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Project Period (FY) |
2017-06-30 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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Keywords | スピン軌道相互作用 / 液体金属 / 角度分解光電子分光 / 低速電子回折 / トポロジカル相転移 / トポロジカル絶縁体 / 擬似液体層(QLL) / 表面電子状態 / トポロジカル表面状態 / 擬似液体層 / Rashba効果 |
Outline of Final Research Achievements |
In this study, I tried to reveal the role of spin-orbit interaction in the electronic structure of liquid metals. On this purpose, Quasi-Liquid layers of the heavy-element crystals, which is expected to appear slightly below the melting point of the 3D crystals, and its spin and orbital polarization structures were searched by electron diffraction and photoelectron spectroscopy. Although the target material, single crystal of Bismuth, did not show any signature of QLL even at the melting point, the new, unexpected change in the surface electronic structure indicating temperature-driven topological phase transition was discovered.
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Academic Significance and Societal Importance of the Research Achievements |
本研究では当初予定していた液体金属相の電子状態の追跡は残念ながら困難だったが、一方で研究開始当初は全く予測していなかった温度変化によるトポロジカル相転移を示す電子状態の変化を見出した。温度によるトポロジカル相転移と、それに伴う熱流・スピン流のエネルギー変換技術は持続可能な社会発展に際してスピントロニクス技術が貢献を期待される分野の一つであり、本研究では当初意図した内容とは異なってしまったものの、有意義な新しい知見を得ることができたと考える。
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Report
(4 results)
Research Products
(25 results)
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[Journal Article] Fermi level tuning of one-dimensional giant Rashba system on a semiconductor substrate: Bi/GaSb(110)-(2×1)2019
Author(s)
T. Nakamura, Y. Ohtsubo, N. Tokumasu, P. Le Fevre, F. Bertran, S. Ideta, K. Tanaka, K. Kuroda, K. Yaji, A. Harasawa, S. Shin, F. Komori , S. Kimura
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Journal Title
Physical Review Materials
Volume: 3
Issue: 12
Pages: 126001-126001
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Surface electronic states of Au-induced nanowires on Ge(001)2018
Author(s)
Yaji Koichiro、Yukawa Ryu、Kim Sunghun、Ohtsubo Yoshiyuki、Le Fevre Patrick、Bertran Francois、Taleb-Ibrahimi Amina、Matsuda Iwao、Nakatsuji Kan、Shin Shik、Komori Fumio
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Journal Title
Journal of Physics: Condensed Matter
Volume: 30
Issue: 7
Pages: 075001-075001
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Temperature-driven topological phase transition proposed from surface electronic structure of bismuth, a topological border material2019
Author(s)
Y. Ohtsubo, Y. Yamashita, J. Kishi, S. Ideta, K. Tanaka, H. Yamane, J. E. Rault, F. Bertran, P. Le Fevre, S. Kimura
Organizer
The 40th International Conference on Vacuum Ultaraviolet and X-ray Physics
Related Report
Int'l Joint Research
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[Presentation] New Surface Atomic Structures on the Topological Kondo Insulator SmB62019
Author(s)
Y. Ohtsubo, P. Xie, R. Yukawa, K. Horiba, H. Kumigashira, S. Ideta, K. Tanaka, K. Miyamoto, T. Okuda, W. Hirano, F. Iga, S. Kimura
Organizer
International Conference on Strongly Correlated Electron Systems 2019
Related Report
Int'l Joint Research
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[Presentation] Giant Rashba-type spin-split electronic states in quasi-1D surface system2018
Author(s)
Y. Ohtsubo, T. Nakamura, Y. Yamashita, K. Yaji, A. Harasawa, S. Shin, F. Komori, R. Yukawa, K. Horiba, H. Kumigashira, S. Kimura
Organizer
Magnetic Single Nano-Object Workshop & School
Related Report
Int'l Joint Research
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[Presentation] Topological surface states of the Kondo insulator SmB6 unveiled from the new crystal orientation2018
Author(s)
Y. Ohtsubo, Y. Yamashita, K. Hagiwara, S. Ideta, K. Tanaka, R. Yukawa, K. Horiba, H. Kumigashira, K. Miyamoto, T. Okuda, W. Hirano, F. Iga, S. Kimura
Organizer
International Workshop on Trends in Advanced Spectroscopy in Materials Science
Related Report
Int'l Joint Research
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[Presentation] InAs(110)表面上の擬一次元的Biにおける異方的Rashba効果2018
Author(s)
中村拓人, 大坪嘉之, 山下雄紀, 出田真一郎, 田中清尚, 矢治光一郎, 原沢あゆみ, 小森文夫, 辛埴, 木村真一, 湯川龍, 堀場弘司, 組頭広志
Organizer
日本物理学会
Related Report
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