2017 Fiscal Year Final Research Report
Theory for exciton condensation and novel superconductivity induced by interband interaction
| 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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| 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 |
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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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| Free Research Field |
強相関電子系の理論
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