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Non-Bloch band theory of non-Hermitian Hamiltonians in the symplectic class

机译:辛阶级非隐士汉密尔顿人的非白板乐队理论

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摘要

Non-Hermitian Hamiltonians are generally sensitive to boundary conditions, and their spectra and wave functions under open boundary conditions are not necessarily predicted by the Bloch band theory for periodic boundary conditions. To elucidate such a non-Bloch feature, recent works have developed a non-Bloch band theory that works even under arbitrary boundary conditions. Here, it is demonstrated that the standard non-Bloch band theory breaks down in the symplectic class, in which non-Hermitian Hamiltonians exhibit Kramers degeneracy because of reciprocity. Instead, a modified non-Bloch band theory for the symplectic class is developed in a general manner, as well as illustrative examples. This nonstandard non-Bloch band theory underlies the Z_2 non-Hermitian skin effect protected by reciprocity.
机译:非私人汉密尔顿人通常对边界条件敏感,并且它们的光谱和波浪在开放边界条件下的功能不一定是由Bloch频段理论进行定期边界条件的预测。为了阐明这样的非BLOCH特征,最近的作品已经开发出一种即使在任意边界条件下也有效的非BLOCH频段理论。在这里,证明标准的非Bloch频段理论在辛阶级中断,其中非私人汉密尔顿人因互惠而展示克拉姆斯退化。相反,以一般方式开发了对辛类的修改的非Bloch频带理论,以及说明性示例。这一非标准非Bloch频段理论下潜受互惠保护的Z_2非封闭症皮肤效应。

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  • 来源
    《Physical review》 |2020年第19期|195147.1-195147.12|共12页
  • 作者单位

    Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan;

    Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan;

    Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan;

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