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Functional renormalization group study of orbital fluctuation mediated superconductivity: Impact of the electron-boson coupling vertex corrections
http://hdl.handle.net/2237/25206
387997f0-2222-4427-93fc-533fe2a454e6
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 | 2016-12-15 | |||||
タイトル | ||||||
タイトル | Functional renormalization group study of orbital fluctuation mediated superconductivity: Impact of the electron-boson coupling vertex corrections | |||||
著者 |
Tazai, Rina
× Tazai, Rina× Yamakawa, Youichi× Tsuchiizu, Masahisa× Kontani, Hiroshi |
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権利 | ||||||
権利情報 | © 2016 American Physical Society | |||||
抄録 | ||||||
内容記述 | In various multiorbital systems, the emergence of the orbital fluctuations and their role on the pairing mechanism attract increasing attention. To achieve deep understanding on these issues, we perform a functional renormalization group (fRG) study for the two-orbital Hubbard model. The vertex corrections for the electron-boson coupling (U-VC), which are dropped in the Migdal-Eliashberg gap equation, are obtained by solving the RG equation. We reveal that the dressed electron-boson coupling for the charge channel Uˆceff becomes much larger than the bare Coulomb interaction Uˆ0 due to the U-VC in the presence of moderate spin fluctuations. For this reason, the attractive pairing interaction due to the charge or orbital fluctuations is enlarged by the factor (Uˆceff/Uˆ0)2>>1. In contrast, the spin fluctuation pairing interaction is suppressed by the spin-channel U-VC, because of the relation Uˆseff<<Uˆ0. The present study demonstrates that the orbital or charge fluctuation pairing mechanism can be realized in various multiorbital systems thanks to the U-VC, such as in Fe-based superconductors. | |||||
内容記述タイプ | Abstract | |||||
出版者 | ||||||
出版者 | American Physical Society | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2469-9950 | |||||
書誌情報 |
Physical Review B 巻 94, p. 115155-115155, 発行日 2016-09-26 |
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値 | publisher | |||||
URI | ||||||
識別子 | http://doi.org/10.1103/PhysRevB.94.115155 | |||||
識別子タイプ | DOI | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/25206 | |||||
識別子タイプ | HDL |