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arXiv 1701.07884cond-mat.supr-concond-mat.str-el
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重整化群预测对对通道的能带结构依赖性

Band-structure-dependence of renormalization-group prediction on pairing channels

Yi-Ting Hsu, Alejandro Federico Rebola, Craig J. Fennie, Eun-Ah Kim

摘要:

最近的实验进展,利用应变工程显着改变适度关联系统的能带结构提供了机会和挑战,弱耦合重整化群(RG)分析方法预测超导不稳定性。一方面,RG方法可以提供理论指导。另一方面,现在必须更好地理解RG方法的预测如何依赖于微观和非通用模型细节。在这里,我们专注于角度分辨光电子能谱中经常观察到的带选择质量重整化的影响。针对单轴应变$\rm{Sr_2RuO_4}$的一个具体例子,我们从两组能带结构出发进行弱耦合RG分析:一组是基于密度泛函理论(DFT)计算,另一组是基于角度分辨光电子能谱(ARPES)测量。尽管两个能带结构的费米面之间的良好的协议,我们发现两套能带结构预测定性不同的趋势,在应变依赖的超导转变温度$T_c$以及占主导地位的通道。

英文摘要:

Recent experimental advances in using strain engineering to significantly alter the band structure of moderately correlated systems offer opportunities and challenges to weak-coupling renormalization group (RG) analysis approaches for predicting superconducting instabilities. On one hand, the RG approach can provide theoretical guidance. On the other hand, it is now imperative to better understand how the predictions of the RG approach depends on microscopic and non-universal model details. Here we focus on the effect of band-selective mass-renormalization often observed in angle resolved photoemission spectroscopy. Focusing on a specific example of uniaxially strained $\rm{Sr_2RuO_4}$ we carry out the weak-coupling RG analysis from two sets of band structures as starting points: one is based on density functional theory (DFT) calculations and the other is based on angle-resolved photoemission spectroscopy (ARPES) measurements. Despite good agreement between the Fermi surfaces of the the two band structures we find the two sets of band structures to predict qualitatively different trends in the strain dependence of the superconducting transition temperature $T_c$ as well as the dominant channel.

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