19-22 October 2011
Hotel Roanoke, Roanoke VA
US/Eastern timezone
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Unusual criticality in a generalized XY model

22 Oct 2011, 12:45
Crystal Ballroom B (Hotel Roanoke, Roanoke VA)

Crystal Ballroom B

Hotel Roanoke, Roanoke VA


Yifei Shi (University of Virginia)


We study the generalized XY model in two dimension, which has a term proportional to cos(2 theta) in addition to the normal XY Hamiltonian. This corresponds to having half vortices connected by solitons, as well as integer vortices. From both renormalization group analysis and Monte Carlo simulation using the worm algorithm, we find that the phase diagram includes Kosterlitz-Thouless transitions of half and integer vortices, together with an Ising transition. Remarkably, part of the Ising line is a direct transition from the quasi-long-ranged ordered state to the disordered state.

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