First-order phase transition in easy-plane quantum antiferromagnets

Details First-order phase transition in easy-plane quantum antiferromagnets First-order phase transition in easy-plane quantum antiferromagnets

2006-09-14

arxiv.org/abs/cond-mat/0609336v3

Phys Rev Lett, 97, 247201 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures. Stylistic changes, references added

Scientific paper

10.1103/PhysRevLett.97.247201

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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