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  1. B100 理学部/理学研究科
  2. B100a 雑誌掲載論文
  3. 学術雑誌

Functional renormalization group study of orbital fluctuation mediated superconductivity: Impact of the electron-boson coupling vertex corrections

http://hdl.handle.net/2237/25206
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
PhysRevB_94_115155.pdf PhysRevB_94_115155.pdf (915.8 kB)
Item type 学術雑誌論文 / Journal Article(1)
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
言語 en
著者 Tazai, Rina

× Tazai, Rina

WEKO 68040

en Tazai, Rina

Search repository
Yamakawa, Youichi

× Yamakawa, Youichi

WEKO 68041

en Yamakawa, Youichi

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Tsuchiizu, Masahisa

× Tsuchiizu, Masahisa

WEKO 68042

en Tsuchiizu, Masahisa

Search repository
Kontani, Hiroshi

× Kontani, Hiroshi

WEKO 68043

en Kontani, Hiroshi

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
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.
言語 en
内容記述タイプ Abstract
出版者
言語 en
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
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1103/PhysRevB.94.115155
ISSN
収録物識別子タイプ PISSN
収録物識別子 2469-9950
書誌情報 en : Physical Review B

巻 94, p. 115155-115155, 発行日 2016-09-26
著者版フラグ
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
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