| Time：1140423 (Wed.) 14:20~16:20 Speaker ：Prof.曾郁欽(Yu-Chin Tzeng) 國立陽明交通大學電子物理學系/Department of Electrophysics, National Yang Ming Chiao Tung University Title：Entanglement Hamiltonian and effective temperature of non-Hermitian quantum spin ladders Abstract： 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 talk, I will introduce my recent work on the quantum entanglement for non-Hermitian systems. Particularly 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, 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. Place：S101, Gongguan Campus, NTNU |
