2023 Fiscal Year Final Research Report
Emergent quantization phenomena in strongly coupled hybrid open quantum systems
| Project/Area Number |
20H01830
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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 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Kyushu University (2021-2023)
Tohoku University (2020) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
荒木 康史 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究副主幹 (10757131)
佐藤 正寛 千葉大学, 大学院理学研究院, 教授 (90425570)
三澤 貴宏 早稲田大学, 理工学術院, 主任研究員(研究院准教授) (10582687)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | トポロジカル物性 |
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| Outline of Final Research Achievements |
In this project, we mainly focused on topological materials and elucidated new transport phenomena and proximity effects that can occur in open systems. In topological Dirac semimetals, a helical gapless state is formed on the surface due to band topology and spin-orbit interaction. In a system in which a ferromagnetic material is placed close to the surface, it was revealed that when an electric field is applied to a topological Dirac semimetal, a spin Hall flow is generated and a semi-quantized torque is generated in the nearby ferromagnetic material. We also discovered that in a system in which a ferromagnetic electrodes are attached to a topological Dirac semimetal, a Hall effect with a value close to the theoretical maximum occurs.
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| Free Research Field |
物性物理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果ではトポロジカル物質における新しい磁気輸送現象およびスピントロニクス効果を明らかにした．トポロジカル物質では電気と磁気の自由度が非自明に結合することが知られているが，本研究成果はそれらに開放系や近接効果という新しい要素を加えることで，当該分野の学術的知見をより進化させたものといえる．一方で，トポロジカルDirac半金属の準量子化スピントルク効果は従来の金属に比べ低エネルギー散逸かつ高効率でのスピントロニクス機能を提案したという点で応用上も重要な結果である．
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