Critical Exponents in a Quantum Phase Transition of an Anisotropic 2D Antiferromagnet

Details Critical Exponents in a Quantum Phase Transition of an Anisotropic 2D Antiferromagnet Critical Exponents in a Quantum Phase Transition of an Anisotropic 2D Antiferromagnet

2006-11-05

arxiv.org/abs/cond-mat/0611114v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

I use the two-step density-matrix renormalization group method to extract the critical exponents $\beta$ and $\nu$ in the transition from a N\'eel $Q=(\pi,\pi)$ phase to a magnetically disordered phase with a spin gap. I find that the exponent $\beta$ computed from the magnetic side of the transition is consistent with that of the classical Heisenberg model, but not the exponent $z\nu$ computed from the disordered side. I also show the contrast between integer and half-integer spin cases.

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