Nematicity-enhanced superconductivity in systems with a non-Fermi liquid behavior
Nematicity-enhanced superconductivity in systems with a non-Fermi liquid behavior
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DOI：
10.1088/1361-648x/acc6af
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发表时间：
2021-10
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影响因子：
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通讯作者：
Sharareh Sayyad;Motoharu Kitatani;Abolhassan Vaezi;H. Aoki
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作者：
Sharareh Sayyad;Motoharu Kitatani;Abolhassan Vaezi;H. Aoki
我们在三角晶格上的部分平带（PFB）模型中探索了向列性（六重旋转对称的自发破缺）、超导性和非费米液体行为之间的相互作用。一个关键的结果是，由多体效应驱动的向列性（波美拉丘克不稳定性）在平带系统中更强，以系统的方式提高了超导转变温度。在那里，一个似是而非的sx2+y2 - dx2 - y2 - dxy -波对称，取代了传统的dx2 - y2 -波，控制着向列性增强的配对，并使填充轴上的tc圆突急剧上升。当六重对称被自发破坏时，在实际空间中，与强制对称时相比，配对相互作用在更紧的对中变得更强。这些都伴随着多体相互作用的PFBs中电子的非费米特征。
We explore the interplay between nematicity (spontaneous breaking of the sixfold rotational symmetry), superconductivity, and non-Fermi liquid behavior in partially flat-band (PFB) models on the triangular lattice. A key result is that the nematicity (Pomeranchuk instability), which is driven by many-body effect and stronger in flat-band systems, enhances superconducting transition temperature in a systematic manner on the T c dome. There, a plausible sx2+y2−dx2−y2−dxy -wave symmetry, in place of the conventional dx2−y2 -wave, governs the nematicity-enhanced pairing with a sharp rise in the T c dome on the filling axis. When the sixfold symmetry is spontaneously broken, the pairing interaction is shown to become stronger with more compact pairs in real space than when the symmetry is enforced. These are accompanied by a non-Fermi character of electrons in the PFBs with many-body interactions.