| Project/Area Number |
17K05517
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 磁性 / マヨラナ粒子 / 量子スピン / スピン液体 / エニオン / トポロジカル物質 / キタエフ・モデル / トポロジカル相 / 熱ホール効果 / スピン流 / 超伝導 / スピントルク / トポロジカル励起 / 物性理論 / 強相関電子系 |
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| Outline of Final Research Achievements |
In this research project, novel quantum phenomena associated with Majorana particles in the Kitaev spin liquid state are theoretically explored. In contrast to conventional magnets, Kitaev magnets do not show magnetic order even at zero temperature, and moreover, in the spin liquid state, a Majorana particle emerges from the fractionalization of an electron, and has only a half degrees of freedom of an electron. The Majorana particles in solid state materials are important, and attracting much attention, because they can be applied to quantum computation. We have clarified that non-Kitaev interactions, which exist in real candidate materials of Kitaev magnets, drasticallt change properties of Majorana particles, inducing novel topological quantum phenomena.
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| Academic Significance and Societal Importance of the Research Achievements |
キタエフ磁性体で実現が期待されるマヨラナ粒子状態は、近未来の量子情報への応用の観点から国内外で非常に興味が持たれ、活発に研究がされている。本研究で明らかになった新しいマヨラナ粒子の性質である、マヨラナ・フェルミ面やトポロジカル相転移は、将来の候補物質におけるマヨラナ粒子の実験探索に利用できると期待される。さらに本研究で新たに分かったマヨラナ粒子の性質を用いて、マヨラナ粒子を制御して、量子計算に応用する新しい方法の開発にも利用できる可能性がある。
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