Abstract
We concentrate on the skin effects and topological edge states in the nonreciprocal non-Hermitian Su-Schrieffer-Heeger (SSH) chain, by taking into account the presence of -symmetric imaginary potentials. Following a detailed demonstration of the theoretical method, we find that, regardless of the application manner of -symmetric imaginary potentials, they take weak impacts from the skin effect of bulk states, but efficiently modulate the topological edge states. On the other hand, if such potentials are applied according to two domains, the skin effect and new edge states can be induced along the domain wall, which are also dependent on the structural parameters. Therefore, the findings in this paper promote understanding of the independent modulations of the skin effects and topological edge states via the interplay between the imaginary potentials and nonreciprocal couplings in the SSH lattices.
4 More- Received 25 November 2023
- Accepted 22 March 2024
DOI:https://doi.org/10.1103/PhysRevA.109.042203
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