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Updated: Jul 17, 2026

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Published on: October 5, 2013
First-order phase transition in easy-plane quantum antiferromagnets
S Kragset1, E Smørgrav, J Hove
1Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
Abstract:
Quantum phase transitions in Mott insulators do not fit easily into the Landau-Ginzburg-Wilson paradigm. A recently proposed alternative to it is the so-called deconfined quantum criticality scenario, providing a new paradigm for quantum phase transitions. In this context it has recently been proposed that a second-order phase transition would occur in a two-dimensional spin 1/2 quantum antiferromagnet in the deep easy-plane limit. A check of this conjecture is important for understanding the phase structure of Mott insulators. To this end we have performed large-scale Monte Carlo simulations on an effective gauge theory for this system, including a Berry-phase term that projects out the S=1/2 sector. The result is a first-order phase transition, thus contradicting the conjecture.
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