期刊
PHYSICAL REVIEW B
卷 105, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.075126
关键词
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资金
- National Natural Science Foundation of China [11974293, 11874187, 12174168]
- Fundamental Research Funds for Central Universities [20720180015]
This paper investigates the relationship between edge entanglement entropy and topological properties in non-Hermitian systems, and extends it to non-Hermitian interacting systems. It is found that the presence of interactions weakens the breakdown of the bulk-boundary correspondence.
Dramatically different from the Hermitian systems, the conventional bulk-boundary correspondence (BBC) is broken in the non-Hermitian systems. In this paper, we use edge entanglement entropy to characterize the topological properties of non-Hermitian Su-Schrieffer-Heeger Hubbard model. For free fermions, we study the scaling behavior of entanglement entropy and demonstrate that the edge entanglement entropy is a good indicator to delimit different phases of non-Hermitian systems. We further generalize the edge entanglement entropy to the non-Hermitian interacting Hubbard chain and obtain the topological phase diagram in the plane of interaction and non-Hermitian hopping amplitudes. It is found that the Hubbard interaction diminishes and weakens the breakdown of the bulk-boundary correspondence, which eventually disappears at some critical value of interaction.
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