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Classification of critical points in energy bands based on topology, scaling, and symmetry

机译:基于拓扑,缩放和对称性对能带中的关键点进行分类

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摘要

A critical point of the energy dispersion is the momentum where electron velocity vanishes. At the corresponding energy, the density of states (DOS) exhibits nonanalyticity such as divergence. Critical points can be first classified as ordinary and high-order ones, and the ordinary critical points have been studied thoroughly by Leon van Hove, whose DOS is particle-hole symmetric and logarithmically divergent. In this work, we describe and classify high-order critical points based on topology, scaling, and symmetry. We show that high-order critical points can have power-law-divergent DOS with particle-hole asymmetry, and can be realized at generic or symmetric momenta by tuning a few parameters such as twist angle, strain, pressure, and/or external fields.
机译:能量分散的关键点是电子速度消失的动量。在相应的能量下,状态密度(DOS)表现出非解析性,例如发散。临界点可以首先分为普通和高阶,临界点已经由Leon van Hove进行了深入研究,其DOS是粒子-孔对称且对数发散的。在这项工作中,我们根据拓扑,缩放和对称性描述和分类高阶临界点。我们表明,高阶临界点可以具有幂律发散的DOS,且粒子孔不对称,并且可以通过调整一些参数(例如扭曲角,应变,压力和/或外部场)以通用或对称矩来实现。

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  • 来源
    《Physical review》 |2020年第12期|125120.1-125120.16|共16页
  • 作者

    Noah F. Q. Yuan; Liang Fu;

  • 作者单位

    Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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