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arXiv 1806.06952cond-mat.mes-hallquant-ph
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非厄米系统界面的边缘态

Edge states at the interface of non-Hermitian systems

C. Yuce

摘要:

拓扑边缘态出现在拓扑不同的两个厄米绝缘体的界面处。我们研究了这一想法的扩展到非厄米特系统。考虑PT对称、拓扑不同的实谱非厄米绝缘体,研究它们界面的拓扑边态。我们表明,PT对称性自发破缺的拓扑相变的界面。因此,界面处出现具有复杂能量本征值的拓扑边缘态。我们将我们的想法应用到一个复杂的扩展的苏-Schrieffer-Heeger(SSH)模型。

英文摘要:

Topological edge states appear at the interface of topologically distinct two Hermitian insulators. We study the extension of this idea to non-Hermitian systems. We consider PT symmetric and topologically distinct non-Hermitian insulators with real spectra and study topological edge states at the interface of them. We show that PT symmetry is spontaneously broken at the interface during the topological phase transition. Therefore topological edge states with complex energy eigenvalues appear at the interface. We apply our idea to a complex extension of the Su-Schrieffer-Heeger (SSH) model.

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