Topological edge states of the PT-symmetric Su-Schrieffer-Heeger model: An effective two-state description

A. F. Tzortzakakis, A. Katsaris, N. E. Palaiodimopoulos, P. A. Kalozoumis, G. Theocharis, K. Diakonos, D. Petrosyan

PHYSICAL REVIEW A（2022）

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Abstract

We consider the non-Hermitian, parity -time-[(PT)-] symmetric extensions of the one-dimensional Su-Schrieffer-Heeger model in the topological nontrivial configuration. We study the properties of the topologically protected edge states and develop an effective two-state analytical description of the system that accurately predicts the PT-symmetry-breaking point for the edge states. We verify our analytical results by exact numerical calculations.

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Key words

topological edge states,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml><mmlmi,su-schrieffer-heeger,two-state

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