2017 Fiscal Year Research-status Report
Spin-orbit coupling effects in spin manipulation and transport control
| Project/Area Number |
17K05510
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
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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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Keywords | spinronics / anisotropy / interference / interferometry / spin / Rashba / spin-orbit |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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| Causes of Carryover |
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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| Remarks |
Preprint of a manuscript under review with title "Gate-controlled anisotropy in Aharonov-Casher spin interference"
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