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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| 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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Report
(5 results)
Research Products
(32 results)
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[Journal Article] Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates2016
Author(s)
A. Yamasaki, H. Fujiwara, S. Tachibana, D. Iwasaki, Y. Higashino, C. Yoshimi, K. Nakagawa, Y. Nakatani, K. Yamagami, H. Aratani, O. Kirilmaz, M. Sing, R. Claessen, H. Watanabe, T. Shirakawa, S. Yunoki, A. Naitoh, K. Takase, J. Matsuno, H. Takagi, A. Sekiyama, and Y. Saitoh
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Journal Title
Phys. Rev. B
Volume: 94
Issue: 11
Pages: 1151031-10
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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