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arXiv 1105.4897cond-mat.supr-concond-mat.str-el
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铁基超导体有效双带模型直到两圈阶的完全重整化群计算

Complete renormalization group calculation up to two-loop order of an effective two-band model for iron-based superconductors

Vanuildo S. de Carvalho, Hermann Freire

摘要:

我们对描述最近发现的铁基超导体的有效低能双带模型进行了重整化群(RG)研究。我们的出发点是Chubukov \emph{et al.}提出的巡回电子模型[Phys. Rev. B \textbf{78},134512(2008)],它显示了两个小的,几乎嵌套的费米口袋,一个空穴口袋以$(0,0)$为中心,一个电子口袋以$\mathbf{Q} = (π,π)$为中心,位于折叠布里渊区。然后,我们着手实施一个完整的两个循环RG计算四点顶点校正,准粒子的重量和几个顺序参数的可扩展性,以评估的鲁棒性的单循环RG结果在文献中提供的,包括自能效应和高阶量子涨落的模型。

英文摘要:

We perform a renormalization group (RG) study up to two-loop order of an effective low-energy two-band model to describe some of the recently discovered iron-based superconductors. Our starting point is the itinerant electronic model proposed by Chubukov \emph{et al.} [Phys. Rev. B \textbf{78}, 134512 (2008)], which displays two small, almost nested Fermi pockets with one hole pocket centered at $(0,0)$ and one electron pocket centered at $\mathbf{Q} = (π,π)$ in the folded Brillouin zone. We then proceed to implement a complete two-loop RG calculation for this model of four-point vertex corrections, quasiparticle weight and several order-parameter susceptibilities in order to evaluate the robustness of one-loop RG results available in the literature with respect to including self-energy effects and higher-order quantum fluctuations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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