Critical Exponents of the Quantum Phase Transition in a Planar Antiferromagnet
- 15 October 1997
- journal article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 66 (10) , 2957-2960
- https://doi.org/10.1143/jpsj.66.2957
Abstract
We have performed a large scale quantum Monte Carlo study of the quantum phase transition in a planar spin-1/2 Heisenberg antiferromagnet with CaV4O9 structure. We obtain a dynamical exponent z=1.018+/-0.02. The critical exponents beta, nu and eta agree within our errors with the classical 3D O(3) exponents, expected from a mapping to the nonlinear sigma model. This confirms the conjecture of Chubukov, Sachdev and Ye [Phys. Rev. B 49, 11919 (1994)] that the Berry phase terms in the planar Heisenberg antiferromagnet are dangerously irrelevant.Comment: 5 pages including 4 figures; revised version: some minor changes and added referenceKeywords
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