Topological properties in the non-Hermitian tetramerized Su-Schrieffer-Heeger lattices

TL;DR

This paper investigates how imaginary onsite potentials in a tetramerized non-Hermitian SSH lattice influence its topological phases, revealing extended nontrivial regions, spontaneous symmetry breaking, and novel edge states.

Contribution

It introduces a novel non-Hermitian tetramerized SSH model with imaginary potentials, demonstrating their role in topological phase transitions and edge state properties.

Findings

Extended topologically-nontrivial regions due to imaginary potentials

Observation of non-Hermitian spontaneous breaking of anti-PT symmetry

Emergence of new edge states with different locality characteristics

Abstract

In this paper, we study the topological properties of the non-Hermitian Su-Schrieffer-Heeger (SSH) lattice by periodically introducing onsite imaginary potentials in the manner of ($i\gamma_1$, $-i\gamma_2$, $-i\gamma_1$, $i\gamma_2$) where $\gamma_1$ and $\gamma_2$ are the imaginary potential strengths. Results show that by changing the lattice to a tetramerized non-Hermitian system, such imaginary potentials induce the nontrivial transition of the topological properties of the SSH system. First, the topologically-nontrivial region is extended, followed by the non-Hermitian spontaneous breaking of the anti-$\cal PT$ symmetry. In addition, new edge state appears, but its locality is different from the state induced by the Hermitian SSH lattice. If such potentials are strong enough, the bulk states of this system can become purely imaginary states. We believe that these imaginary potentials play special roles in modulating the topological properties of the non-Hermitian SSH lattice.