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Cooperative Effect of Coulomb Interaction and Electron-Phonon Coupling on the Heavy Fermion State in the Two-Orbital Periodic Anderson Model
http://hdl.handle.net/10191/26839
http://hdl.handle.net/10191/26839e0828748-9ff7-4ab5-b5fe-fb9593600a0e
名前 / ファイル | ライセンス | アクション |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2014-04-15 | |||||
タイトル | ||||||
タイトル | Cooperative Effect of Coulomb Interaction and Electron-Phonon Coupling on the Heavy Fermion State in the Two-Orbital Periodic Anderson Model | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Cooperative Effect of Coulomb Interaction and Electron-Phonon Coupling on the Heavy Fermion State in the Two-Orbital Periodic Anderson Model | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | heavy fermion | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | periodic Anderson model | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | orbital degeneracy | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Coulomb interaction | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | electron-phonon coupling | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Jahn-Teller phonon | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | dynamical mean-field theory | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Mitsumoto, Keisuke
× Mitsumoto, Keisuke× Ono, Yoshiaki |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We investigate the two-orbital periodic Anderson model, where the local orbital fluctuations of f-electrons couple with a two-fold degenerate Jahn-Teller phonon, by using the dynamical mean-field theory. It is found that the heavy fermion state caused by the Coulomb interaction between f-electrons U is largely enhanced due to the electron-phonon coupling g, in contrast to the case with the single-orbital periodic Anderson model where the effects of U and g compete to each other. In the heavy fermion state for large U and g, both the orbital and lattice fluctuations are enhanced, while the charge (valence) and spin fluctuations are suppressed. In the strong coupling regime, a sharp soft phonon mode with a large spectral weight is observed for small U, while a broad soft phonon mode with a small spectral weight is observed for large U. The cooperative effect of U and g for half-filling with two f-electrons per atom nf = 2 is more pronounced than that for quarter-filling with nf = 1. | |||||
書誌情報 |
Journal of the Physical Society of Japan en : Journal of the Physical Society of Japan 巻 79, 号 5, p. 054707-1-054707-7, 発行日 2010-05 |
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出版者 | ||||||
出版者 | 日本物理学会 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00319015 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00704814 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1143/JPSJ.79.054707 | |||||
権利 | ||||||
権利情報 | Copyright (C) 2010 The Physical Society of Japan | |||||
著者版フラグ | ||||||
値 | author | |||||
異版である | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | URI | |||||
関連識別子 | http://journals.jps.jp/doi/abs/10.1143/JPSJ.79.054707 |