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arXiv 2302.02771cond-mat.str-elcond-mat.mtrl-sci
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相互作用诱导的金属到拓扑绝缘体转变

Interaction-induced Metal to Topological Insulator Transition

Yu-Chin Tzeng, Po-Yao Chang, Min-Fong Yang

AI总结:

本文通过精确对角化研究强Hubbard排斥下四分之一填充的BHZ模型,发现强关联可将金属态转变为具有饱和磁化的Chern绝缘体,且该拓扑相变为一级相变,为寻找相互作用诱导的拓扑相提供指导。

摘要:

通过精确对角化方法,我们研究了在强Hubbard在位排斥极限下、四分之一填充的Bernevig-Hughes-Zhang模型。我们发现,在强关联作用下,非相互作用的金属态会转变为具有饱和磁化的Chern绝缘体。也就是说,在这种金属-绝缘体转变中,由于基态中时间反演对称性的自发破缺,系统的拓扑性质和磁性质都发生了改变。根据我们的发现,这种拓扑相变似乎是一级相变。我们的结果揭示了拓扑Mott转变中有趣的物理,并为在类似体系中寻找更多由相互作用诱导的拓扑相提供了指导。

英文摘要:

By means of exact diagonalizations, the Bernevig-Hughes-Zhang model at quarter-filling in the limit of strong Hubbard on-site repulsion is investigated. We find that the non-interacting metallic state will be turned into a Chern insulator with saturated magnetization under strong correlations. That is, at such a metal-insulator transition, both the topological and the magnetic properties of the system are changed due to spontaneous breaking of time reversal symmetry in the ground states. According to our findings, this topological phase transition seems to be of first order. Our results illustrate the interesting physics in topological Mott transitions and provide guidance to the search of more interaction-induced topological phases in similar systems.

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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