Phases of a 2D planar antiferromagnet in a uniform field
Lee D. H., Joannopoulos J. D., Negele J. W., Landau D. P.
The behavior of a planar antiferromagnet (the XYmodel) is reanalyzed on square and triangular 2D lattices in a uniform magnetic field. The phase diagrams recently proposed by Dotsenko and Uimin are then discussed.