"Topological quantum phase transition in an S=2 spin chain"

Jiadong Zang: Hong-Chen Jiang, Zheng-Yu Weng, and Shou-Cheng Zhang ; Phys. Rev. B, 10/24/10.

Additional Authors: Hong-Chen Jiang, Zheng-Yu Weng, and Shou-Cheng Zhang

Abstract:

We construct a model Hamiltonian for S=2 spin chain, where a variable parameter α is introduced. The edge spin is S=1 for α=0 and S=3/2 for α=1. Due to the topological distinction of the edge states, these two phases must be separated by one or several topological quantum phase transitions. We have studied the quantum phase transition by density matrix renormalization group calculation and proposed a phase diagram for this model.