Spin transport on the surfaces and heterointerfaces of semiconductors and topological insulators
| Project/Area Number |
24340069
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Kyoto University |
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Principal Investigator |
ARUGA Tetsuya 京都大学, 理学(系)研究科(研究院), 教授 (70184299)
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| Co-Investigator(Kenkyū-buntansha) |
HATTA Shinichiro 京都大学, 大学院理学研究科, 助教 (70420396)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2014: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2013: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2012: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Keywords | ラシュバ効果 / 単原子層 / 表面・界面物性 / 電子輸送 / 低次元金属 / スピンエレクトロニクス / 超薄膜 |
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| Outline of Final Research Achievements |
We have developed an experimental method which enables us to measure the sheet conductivity of metallic monolayers on semiconductor surfaces for a temperature range of 5-300 K at a precision much higher than the previous methods. By using this new method in a 7-probe arrangement, we carried out a precise examination of the spin-polarized current hypothesis proposed by Silsbee for 2D Rashba electron systems. By a careful measurement, we concluded that the hypothesis is invalid.
We also studied by a 4-probe method the temperature dependence of the sheet conductivity of a Pb monolayer on Ge(111). We found that the sheet conductivity at 10 K is more than an order of magnitude larger than those of known metallic monolayers, and that the step conductivity is two orders of magnitude larger. We also found subsurface electronic states ubiquitously formed on Ge(111) covered with different elements, which is spin-split by the Rashba effect.
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Report
(4 results)
Research Products
(23 results)
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[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
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Journal Title
J. Electron Spectros. Relat. Phenom
Volume: 201
Pages: 92-97
DOI
Related Report
Peer Reviewed
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[Presentation] 表面Rashba効果2014
Author(s)
有賀哲也
Organizer
日本物理学会2014年秋季大会
Place of Presentation
愛知県春日井市
Year and Date
2014-09-07 – 2014-09-10
Related Report
Invited
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