| Autor: |
Pei-Yun Yang, Yu-Chin Tzeng |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
SciPost Physics Core, Vol 7, Iss 4, p 074 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2666-9366 |
| DOI: |
10.21468/SciPostPhysCore.7.4.074 |
| Popis: |
Quantum entanglement plays a crucial role not only in understanding Hermitian many-body systems but also in offering valuable insights into non-Hermitian quantum systems. In this paper, we analytically investigate the entanglement Hamiltonian and entanglement energy spectrum of a non-Hermitian spin ladder using perturbation theory in the biorthogonal basis. Specifically, we examine the entanglement properties between coupled non-Hermitian quantum spin chains. In the strong coupling limit ($J_\mathrm{rung}\gg1$), first-order perturbation theory reveals that the entanglement Hamiltonian closely resembles the single-chain Hamiltonian with renormalized coupling strengths, allowing for the definition of an ad hoc temperature. Our findings provide new insights into quantum entanglement in non-Hermitian systems and offer a foundation for developing novel approaches for studying finite temperature properties in non-Hermitian quantum many-body systems. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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