| 研究課題/領域番号 |
17K05510
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| 研究機関 | 国立研究開発法人理化学研究所 |
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研究代表者 |
サーリコスキ ヘンリー 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (50722245)
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| 研究分担者 |
多々良 源 国立研究開発法人理化学研究所, 創発物性科学研究センター, チームリーダー (10271529)
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| 研究期間 (年度) |
2017-04-01 – 2019-03-31
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| キーワード | spinronics / anisotropy / interference / interferometry / spin / Rashba / spin-orbit |
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| 研究実績の概要 |
The project started in the first year by investigating anisotropy effects in spin interferometers. First, an extended theoretical study of anisotropies in spin interference was carried out. In this study we established a method called anisotropy spin interferometry and showed that it can be used to probe spin phases as well as anisotropies in the spin-orbit fields that are used to control spin phases in ring-shaped interferometers. Three different 1D and 2D numerical methods were used and provided consistent results. This study was published recently in Physical Review B.
After completion of this study we applied the theory to recent anisotropy measurements in a ring device. In a careful comparison with numerical results it was found that an extra transition occured that could not be explained assuming a constant Dresselhaus spin-orbit interaction.
The transition was found to be consistent with stress induced effects in the InGaAs material of the quantum well. We concluded that the extra transition showed emergence of sign inversion of the linear renormalized Dresselhaus interaction. It would therefore show gate-voltage control of the linear Dresselhaus interaction in the interferometer. This study was recently submitted for peer review and uploaded to preprint server.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The initial results of the first fiscal year provided more information than was initially expected. Anisotropy interferometry was found to yield more information about spin-orbit fields as well as spin phases than was initially though at the time the project application was written.
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| 今後の研究の推進方策 |
The initial results pave way for additional studies of spin interference and transport phenomena in different devices. We have planned to perform studies of polygonal quantum rings and compare the results to on-going experiments performed at Tohoku University.
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| 次年度使用額が生じた理由 |
More overseas travel is planned for this fiscal year. Conference trip to Linz (PASPS conference in August) is planned as well as conference trips to Germany in March.
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| 備考 |
Preprint of a manuscript under review with title "Gate-controlled anisotropy in Aharonov-Casher spin interference"
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