Topological quantum phase transition in an S=2 spin chain

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

2010-02-04

arxiv.org/abs/1002.0966v2

Phys.Rev.B81:224430,2010

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

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.

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