Quantum entanglement and correlation in 1D spin chain with anisotropy power-law interactions

报告题目：Quantum entanglement and correlation in 1D spin chain with anisotropy power-law interactions

报告人：任杰副教授 (常熟理工学院)

报告时间：2019年7月10日(星期三) 9:30

报告地点：物理科技楼343

报告邀请人：董裕力

报告摘要：We consider the power-law-decaying spin-1/2 XXZ chain with isotropic ferromagnetic interactions for the xy spin components and ferro- or antiferromagnetic interactions for the z spin components. Effects of the long-range interactions on the nonlocal correlations, entanglement entropy and fidelity using the techniques of density matrix renormalization group are investigated, and their relations with the quantum phase transitions are also analyzed separately. The appearance of long-range interactions not only changes the phase boundaries of the counterparts with short-range interactions, but also leads to the emergence of extoic phases. The long-range interactions in z axis induces a Winger-crystal (WC) phase, while long-range interactions in x-y axis lead to a continuous symmetry breaking (CSB) phase. The ground-state phase diagrams are determined separately.