Electron correlation in quantum point contacts
| Project/Area Number |
18H01811
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | Tohoku University |
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Principal Investigator |
Hirayama Yoshiro 東北大学, 先端スピントロニクス研究開発センター, 特任教授 (20393754)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
Fiscal Year 2020: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | メゾスコピック系 / 量子ポイントコンタクト / 電子相関 / 抵抗検出NMR / 分数量子ホール効果 / 整数量子ホール効果 |
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| Outline of Final Research Achievements |
Transport properties of quantum point contacts (QPCs), which are the basis of semiconductor quantum structures, have been studied using a new type of NMR (resistively detected NMR, RDNMR). The RDNMR was successfully applied in low-magnetic-field region. It was also applied to measure microscopic strain variation. Furthermore, we first found an even-denominator plateau in the QPC diagonal resistance and suggested a possible contribution of mixing of counter-propagating edge channels. In addition, we have successfully demonstrated InSb-QPCs by using trench gates and MRI in semiconductor quantum systems by combining nanoprobe and RDNMR.
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| Academic Significance and Societal Importance of the Research Achievements |
様々なRDNMR測定を進めたり、対角抵抗の偶数分母量子化を研究したりすることで、半導体量子デバイスの最も基礎的なものである量子ポイントコンタクト（QPC）に関する理解が深まった。得られた知見はQPCを用いた量子干渉計や様々な量子デバイスで得られた測定結果の理解、さらにはこれらのデバイスの設計に大変役立つ。また、半導体量子構造のMRIはミクロに半導体量子物性を探る強力な手法になることが期待できる。マヨラナ物性の観点からも注目を集めているInSb系でのQPC作製もインパクトの大きな研究成果である。
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Report
(3 results)
Research Products
(57 results)
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[Journal Article] Electrically tunable effective g-factor of a single hole in a lateral GaAs/AlGaAs quantum dot2019
Author(s)
Sergei Studenikin, Marek Korkusinski, Motoi Takahashi, Jordan Ducatel, Aviv Padawer-Blatt, Alex Bogan, D. Guy Austing, Louis Gaudreau, Piotr Zawadzki, Andrew Sachrajda, Yoshiro Hirayama, Lisa Tracy, John Reno, Terry Hargett
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Journal Title
Communication Physics
Volume: 2
Issue: 1
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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