| Project/Area Number |
26800179
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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 | Institute of Physical and Chemical Research |
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Principal Investigator |
Sakai Shiro 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (80506733)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 高温超伝導 / 銅酸化物 / 動的平均場理論 / 動的構造 / 自己エネルギー / 隠れたフェルミオン / 擬ギャップ / 周波数依存構造 / 銅酸化物高温超伝導体 / 冷却フェルミ原子気体 / フェルミオン的励起 / BCS-BECクロスオーバー / クラスター動的平均場理論 / 国際情報交換（フランス） |
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| Outline of Final Research Achievements |
I studied a theoretical model, which is considered to describe the low-energy electronic structure of cuprate high-temperature superconductors, based on numerical calculations. I particularly focused on the frequency-dependent structure of the self-energy, which describes the electronic correlation effect. As a result, I revealed that the high-temperature superconductivity, as well as an anomalous metallic (pseudogapped) behavior observed on its higher-temperature side, is induced by a hidden fermionic excitation emergent from the electron-correlation effect. This high-temperature superconducting mechanism is distinct from the conventional one mediated by bosonic excitations. This study also clarified the mathematical relationship between the pseudogap and the superconductivity.
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