| Project/Area Number |
26800198
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Waseda University (2016-2017)
Institute of Physical and Chemical Research (2014-2015) |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SEO Hitoshi 理化学研究所, 古崎物性理論研究室, 専任研究員 (30415054)
SEKI Kazuhiro SISSA, 博士研究員 (40708533)
Yunoki Seiji 理化学研究所, 柚木計算物性物理研究室, 准主任研究員 (70532141)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | バンド間相互作用 / エキシトン凝縮 / 超伝導 / 分子性導体 / ダイマー内電荷自由度 / 変分モンテカルロ法 / フィリング制御モット転移 / 幾何学的フラストレーション / 分子性結晶 / 電荷秩序 / 電子・フォノン相互作用 / 電荷密度波 / BCS-BECクロスオーバー / 長距離クーロン相互作用 / 電子・ホール変換 |
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| Outline of Final Research Achievements |
In this research project, I have clarified the emergent mechanism and detailed property of the exciton condensation induced by interband interaction and electron-lattice interaction by using an ideal and a realistic theoretical models. I also have introduced the original electron-hole transformation to dramatically reduce the computational cost in the variational Monte Carlo method, and made massive calculation possible.
I also have studied the model that introduced the intradimer charge degree of freedom and long-range Coulomb interactions, and revealed the phase competition and emergent mechanism of superconductivity in molecular conductors κ-(BEDT-TTF)2X. As for superconductivity, I have found a novel superconducting symmetry characteristic to the system with geometrical frustration. It is beyond the usual theory based on the analogy to the cuprate high-temperature superconductors.
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