| Project/Area Number |
15K05135
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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 I
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| Research Institution | Hyogo Medical University |
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Principal Investigator |
FUKUDA Akira 兵庫医科大学, 医学部, 准教授 (70360633)
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| Co-Investigator(Kenkyū-buntansha) |
寺澤 大樹 兵庫医科大学, 医学部, 助教 (90589839)
佐々木 豊 京都大学, 理学研究科, 教授 (60205870)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 量子ホール効果 / 2次元電子系 / 動的核スピン偏極 / エッジ状態 / 強磁場 / 超低温 / グラフェン / 核スピン / 弱局在効果 / 普遍的電導度揺らぎ |
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| Outline of Final Research Achievements |
Two dimensional electron system (2DES) in high magnetic field is an ideal system to study one dimensional edge state and topological excitation. In the fractional quantum Hall states (QHSs), nuclear spins play an important role for various physics. In this study, using a high-mobility GaAs quantum well sample, QHSs after dynamic nuclear spin polarization (DNP) turn out to be an extremely interesting novel quantum states. During investigation to perform DNP in 2DES of graphene, it is revealed that inert gas adsorption on graphene take effects on transport properties in QHS regime, and weak localization effect is highly related to the universal conductance fluctuation.
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| Academic Significance and Societal Importance of the Research Achievements |
量子ホール状態における核スピンはその拡張性や制御性の良さから量子計算機への応用が検討されているが、本研究成果はその実現に向けて一歩前進させたと考えられる。また、動的核スピンのダイナミクスに関する成果は、最近発展の著しいトポロジカル絶縁体の物理と相補的な研究発展が期待される。さらに、グラフェンにおける希ガス分子吸着効果の観測は、極めて高感度なガス・センサーとしての応用の可能性がある。
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