Absence of vortex condensation in a two dimensional fermionic XY model

Details Absence of vortex condensation in a two dimensional fermionic XY model Absence of vortex condensation in a two dimensional fermionic XY model

2008-01-11

arxiv.org/abs/0801.1857v1

Phys.Rev.D77:054502,2008

Physics

High Energy Physics

High Energy Physics - Lattice

5 pages, 5 figures

Scientific paper

10.1103/PhysRevD.77.054502

Motivated by a puzzle in the study of two dimensional lattice Quantum Electrodynamics with staggered fermions, we construct a two dimensional fermionic model with a global U(1) symmetry. Our model can be mapped into a model of closed packed dimers and plaquettes. Although the model has the same symmetries as the XY model, we show numerically that the model lacks the well known Kosterlitz-Thouless phase transition. The model is always in the gapless phase showing the absence of a phase with vortex condensation. In other words the low energy physics is described by a non-compact U(1) field theory. We show that by introducing an even number of layers one can introduce vortex condensation within the model and thus also induce a KT transition.

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