TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysCore.7.4.074
TI  - Entanglement Hamiltonian and effective temperature of non-Hermitian quantum spin ladders
PY  - 2024/11/20
UR  - https://scipost.org/SciPostPhysCore.7.4.074
JF  - SciPost Physics Core
JA  - SciPost Phys. Core
VL  - 7
IS  - 4
SP  - 074
A1  - Yang, Pei-Yun
AU  - Tzeng, Yu-Chin
AB  - 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.
ER  -

@Article{10.21468/SciPostPhysCore.7.4.074,
	title={{Entanglement Hamiltonian and effective temperature of non-Hermitian quantum spin ladders}},
	author={Pei-Yun Yang and Yu-Chin Tzeng},
	journal={SciPost Phys. Core},
	volume={7},
	pages={074},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhysCore.7.4.074},
	url={https://scipost.org/10.21468/SciPostPhysCore.7.4.074},
}