2016 Fiscal Year Final Research Report
Theory on manybody effects and optical response in electron-hole, semimetal, and Dirac electron systems
| Project/Area Number |
25400327
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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 I
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| Research Institution | Osaka University |
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Principal Investigator |
ASANO Kenichi 大阪大学, 理学研究科, 准教授 (10379274)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 電子正孔系 / 励起子 / 半導体 / 光学応答 / モット転移 / ハバードモデル / カーボンナノチューブ / BCS-BECクロスオーバー |
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| Outline of Final Research Achievements |
We studied the Mott transition in electron-hole system and related matters, which are summarized into three parts:
(1) Using the self-cosistent T matrix approximation, we obtained the ionization ratio of the excitons in two dimension and clarified the whole picture of the crossover between the exciton gas and the electron hole plasma. (2) We dealt the trions in carbon nanotubes by taking account of both the non-parabolicity of the energy band and the inter-band screening effect, and clarified the detailed low energy structure of the ionized exitons, succeeding in making realistic comparison with the experiments. (3) We showed using the variational cluster method that in the frutrated Kagome lattice the Mott transition is driven by the formation of the valence bond crystal.
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| Free Research Field |
物性理論
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