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Diagnosis of explicit symmetry breaking in the tight-binding constructions for symmetry-protected topological systems

机译:对称保护拓扑系统紧密对称性分解的诊断

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摘要

It has been well established that for symmetry-protected topological systems, the nontrivial topology prevents a real space representation using exponentially localized Wannier wave functions (WFs) in all directions, unless the protecting symmetry is sacrificed as an on-site transformation. This makes it challenging to determine the symmetry of various physical observables represented using such WFs. In this work, we propose a practical method for overcoming such challenges using the Kane-Mele model as a concrete example. We present a systematic procedure for diagnosing the symmetry of any observables, as well as a method for constructing symmetric operators up to arbitrary truncation accuracy.
机译:已经确定,对于受对称保护的拓扑系统,非动力拓扑可以防止在所有方向上使用指数局限地局部化的WANNIER波函数(WFS)的真实空间表示,除非牺牲保护对称作为现场转换。这使得确定使用这种WFS表示的各种物理观察到的对称性来挑战。在这项工作中,我们提出了一种使用Kane-Mele模型作为具体示例克服这些挑战的实用方法。我们介绍了诊断任何可观察到的对称性的系统过程,以及构造对称运算符的方法,该方法达到任意截断精度。

著录项

  • 来源
    《Physical review》 |2020年第7期|075142.1-075142.5|共5页
  • 作者

    Xiaoyu Wang; Oskar Vafek;

  • 作者单位

    National High Magnetic Field Laboratory Tallahassee Florida 32310 USA;

    National High Magnetic Field Laboratory Tallahassee Florida 32310 USA Department of Physics Florida State University Tallahassee Florida 32306 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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