| Project/Area Number |
26400346
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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 II
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| Research Institution | Tohoku University |
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Principal Investigator |
Koyama Tomio 東北大学, 金属材料研究所, 教育研究支援者 (30153696)
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| Co-Investigator(Renkei-kenkyūsha) |
MACHIDA Masahiko 国立研究開発法人日本原子力研究開発機構, 計算科学技術センター, 研究主幹 (60360434)
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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 |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 多バンド超伝導体 / 集団励起モード / ヒッグスモード / ヒッグズモード / ゴールドストーンモード / レゲットモード / 電界効果超伝導体 |
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| Outline of Final Research Achievements |
In the superconducting state we have collective excitation modes, which are the oscillation modes of the superconducting gap. In this research project we developed a theory for the collective excitation modes in superconductors with multiple conduction bands, i.e. multiband superconductors. The main results of our research are as follows. We constructed a theory based on the RPA approximation for the collective excitation modes in the time-reversal-symmetry-breaking phase of multiband superconductors and a theory for the Higgs mode in field-effect superconductors.
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