Quantum phase transition in the Plaquette lattice with anisotropic spin exchange

Details Quantum phase transition in the Plaquette lattice with anisotropic spin exchange Quantum phase transition in the Plaquette lattice with anisotropic spin exchange

2003-11-04

arxiv.org/abs/cond-mat/0311071v1

Physics

Condensed Matter

Strongly Correlated Electrons

LaTeX article with 4 pages and 3 figures, prepared with material for the ICM 2003

Scientific paper

I study the influence of anisotropic spin exchange on a quantum phase transition in the Plaquette lattice driven by the purely quantum effect of singlet formation. I study the influence of i) a Dzyaloshinskii-Moriya exchange and ii) four spin exchange on the transition point by evaluating spin--spin correlations and the spin gap with exact diagonalization. The results point to a stabilization of the Neel-like long range order when the Dzyaloshinskii-Moriya exchange is added, whereas the four-spin exchange might stabilize the singlet order as well as the Neel-like order depending on its strength.

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