Topological properties of a non-Hermitian quasi-1D chain with a flat band

• URL: http://arxiv.org/abs/2307.08754v3
• Date: Mon, 18 Dec 2023 14:56:38 GMT
• Title: Topological properties of a non-Hermitian quasi-1D chain with a flat band
• Authors: C.Mart\'inez-Strasser, M.A.J.Herrera, A. Garc\'ia-Etxarri, G.Palumbo, F.K.Kunst and D.Bercioux
• Abstract summary: spectral properties of a non-Hermitian quasi-1D lattice in two of the possible dimerization configurations are investigated. Non-Hermitian diamond chain that presents a zero-energy flat band. Non-Hermitian diamond chains can be mapped into two models of the Su-Schrieffer-Heeger chains, either non-Hermitian, and Hermitian, both in the presence of a flat band.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The spectral properties of a non-Hermitian quasi-1D lattice in two of the possible dimerization configurations are investigated. Specifically, it focuses on a non-Hermitian diamond chain that presents a zero-energy flat band. The flat band originates from wave interference and results in eigenstates with a finite contribution only on two sites of the unit cell. To achieve the non-Hermitian characteristics, the system under study presents non-reciprocal hopping terms in the chain. This leads to the accumulation of eigenstates on the boundary of the system, known as the non-Hermitian skin effect. Despite this accumulation of eigenstates, for one of the two considered configurations, it is possible to characterize the presence of non-trivial edge states at zero energy by a real-space topological invariant known as the biorthogonal polarization. This work shows that this invariant, evaluated using the destructive interference method, characterizes the non-trivial phase of the non-Hermitian diamond chain. For the second non-Hermitian configuration, there is a finite quantum metric associated with the flat band. Additionally, the system presents the skin effect despite the system having a purely real or imaginary spectrum. The two non-Hermitian diamond chains can be mapped into two models of the Su-Schrieffer-Heeger chains, either non-Hermitian, and Hermitian, both in the presence of a flat band. This mapping allows to draw valuable insights into the behavior and properties of these systems.

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