Universality class of S=1/2 quantum spin ladder system with the four spin exchange

Details Universality class of S=1/2 quantum spin ladder system with the four spin exchange Universality class of S=1/2 quantum spin ladder system with the four spin exchange

2001-11-21

arxiv.org/abs/cond-mat/0111399v1

Physical Review B. 65, 104413 (2002)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevB.65.104413

We study s=1/2 Heisenberg spin ladder with the four spin exchange. Combining
numerical results with the conformal field theory(CFT), we find a phase
transition with central charge c=3/2. Since this system has an SU(2) symmetry,
we can conclude that this critical theory is described by k=2 SU(2)
Wess-Zumino-Witten model with Z$_2$ symmetry breaking.

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