Topological quantum phase transition in an S=2 spin chain

TL;DR

This paper investigates a topological quantum phase transition in an S=2 spin chain model, revealing how edge states change with a parameter and identifying the phase diagram through DMRG calculations.

Contribution

The study constructs a novel S=2 spin chain model with variable edge states and analyzes its topological phase transitions using DMRG, providing new insights into topological quantum phases.

Findings

Edge state changes from S=1 to S=3/2 as parameter varies

Identification of topological quantum phase transitions

Proposed phase diagram for the model

Abstract

We construct a model Hamiltonian for S = 2 spin chain, where a variable parameter $\alpha$ is introduced. The edge spin is S = 1 for $\alpha = 0$, and S = 3/2 for $\alpha = 1$. Due to the topological distinction of the edge states, these two phases must be separated by one or several topological quantum phase transitions. We investigate the nature of the quantum phase transition by DMRG calculation, and propose a phase diagram for this model.