Critical theory of the topological quantum phase transition in a spin-2 chain

Details Critical theory of the topological quantum phase transition in a spin-2 chain Critical theory of the topological quantum phase transition in a spin-2 chain

2010-10-20

arxiv.org/abs/1010.4273v2

Phys. Rev. B 82, 220403(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4.25 pages, 5 figures

Scientific paper

We systematically study the phase diagram of S=2 spin chain, by means of density-matrix renormalization group and exact diagonalization methods and confirm the presence of a dimer phase in the AKLT--SZH model. We find that the whole phase boundary between the dimer and SZH phases, including the multicritical point, is a critical line with the same central charge $c=5/2$. Finally, we propose and confirm that this line can be described by the $\rm SO(5)_1$ Wess-Zumino-Witten (WZW) conformal field theory.

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