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arXiv 2103.12756cond-mat.supr-concond-mat.dis-nncond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el
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强关联稳定的高温超导体中的无序鲁棒相晶体

Disorder-robust phase crystal in high-temperature superconductors stabilized by strong correlations

Debmalya Chakraborty, Tomas Löfwander, Mikael Fogelström, Annica M. Black-Schaffer

摘要:

强电子-电子相关性、拓扑零能态和无序的同时相互作用是一个尚未探索的领域,但由于它们不可避免地存在于许多材料中,因此引起了极大的兴趣。氧化铜高温超导体(铜氧化物)具有对断裂边缘,具有拓扑零能态的平坦带,使其成为强相关性,拓扑和无序强烈交织的理想场所。在这里,我们表明,这种相互作用在铜酸盐产生一个新的物质相:一个完全有间隙的"相晶体”状态,打破平移和时间反演不变性,其特征是调制的$d$波超导相共存的调制扩展$s$波超导秩序。与传统的智慧相反,我们发现,这种相晶体状态是非常强大的无所不在的混乱,但只有在存在强相关性,从而给出了一个明确的路线,其实验实现。

英文摘要:

The simultaneous interplay of strong electron-electron correlations, topological zero-energy states, and disorder is yet an unexplored territory but of immense interest due to their inevitable presence in many materials. Copper oxide high-temperature superconductors (cuprates) with pair breaking edges host a flat band of topological zero-energy states, making them an ideal playground where strong correlations, topology, and disorder are strongly intertwined. Here we show that this interplay in cuprates generates a new phase of matter: a fully gapped ``phase crystal" state that breaks both translational and time-reversal invariance, characterized by a modulation of the $d$-wave superconducting phase co-existing with a modulating extended $s$-wave superconducting order. In contrast to conventional wisdom, we find that this phase crystal state is remarkably robust to omnipresent disorder, but only in the presence of strong correlations, thus giving a clear route to its experimental realization.

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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