Reflection-Symmetric Second-Order Topological Insulators and Superconductors

Physical Review Letters
Josias LangbehnPiet W Brouwer

Abstract

Second-order topological insulators are crystalline insulators with a gapped bulk and gapped crystalline boundaries, but with topologically protected gapless states at the intersection of two boundaries. Without further spatial symmetries, five of the ten Altland-Zirnbauer symmetry classes allow for the existence of such second-order topological insulators in two and three dimensions. We show that reflection symmetry can be employed to systematically generate examples of second-order topological insulators and superconductors, although the topologically protected states at corners (in two dimensions) or at crystal edges (in three dimensions) continue to exist if reflection symmetry is broken. A three-dimensional second-order topological insulator with broken time-reversal symmetry shows a Hall conductance quantized in units of e^{2}/h.

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Citations

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Mar 9, 2019·Physical Review Letters·Tao LiuFranco Nori
Oct 28, 2019·Advanced Materials·Zhiwang ZhangJohan Christensen
Dec 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ya-Jie WuSu-Peng Kou
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