Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Researches
Physics of Higher-Order Topological Insulators―Novel Gapless States Emerging at Corners
Motohiko Ezawa
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2020 Volume 75 Issue 5 Pages 289-294

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Abstract

We review a recent progress on higher-order topological systems. We start with a brief history of higher-order topological insulators (HOTIs). Then, we discuss two types of HOTIs. One is the Wannier-type HOTIs, which are extensions of the Su–Schrieffer–Heeger model, and the others are mass-type HOTIs, which are constructed based on topological insulators by adding extra terms. We also explain how these systems are realized in electric circuits. Finally, we extend the notion to non-Hermitian topological systems, where non-Hermitian terms are introduced by dissipation or nonreciprocity.

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© 2020 The Physical Society of Japan
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