Eur. Phys. J. D 50, 103-105 (2008)
https://doi.org/10.1140/epjd/e2008-00202-4

Entanglement, fidelity, and quantum phase transition in antiferromagnetic-ferromagnetic alternating Heisenberg chain

School of Physical Science and Technology, Suzhou University, Suzhou, Jiangsu, 215006, P.R. China

Corresponding authors: ^a 210308021@suda.edu.cn - ^b Szhu@suda.edu.cn

Received: 5 August 2008
Revised: 26 September 2008
Published online: 30 October 2008

Abstract

The fidelity and entanglement entropy in an antiferromagnetic-ferromagnetic alternating Heisenberg chain are investigated by using the method of density-matrix renormalization-group. The effects of anisotropy on fidelity and entanglement entropy are investigated. The relations between fidelity, entanglement entropy and quantum phase transition are analyzed. It is found that the quantum phase transition point can be well characterized by both the ground-state entropy and fidelity for large system.