中国物理B ›› 2013, Vol. 22 ›› Issue (2): 20308-020308.doi: 10.1088/1674-1056/22/2/020308
谭小东, 金柏琪, 高微
Tan Xiao-Dong (谭小东), Jin Bai-Qi (金柏琪), Gao Wei (高微)
摘要: We use the quantum renormalization-group (QRG) method to study the entanglement and quantum phase transition (QPT) in the one-dimensional spin-1/2 Heisenberg-Ising model [Lieb E, Schultz T and Mattis D 1961 Ann. Phys. (N.Y.) 16 407]. We find the quantum phase boundary of this model by investigating the evolution of concurrence in terms of QRG iterations. We also investigate the scaling behavior of system close to the quantum critical point, which shows that the minimum value of the first derivative of concurrence and the position of the minimum scale with an exponent of the system size. And the first derivative of concurrence between two blocks diverges at the quantum critical point, which is directly associated with the divergence of the correlation length.
中图分类号: (Entanglement measures, witnesses, and other characterizations)