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DY: Dynamik und Statistische Physik

DY 16: Phase Transitions

DY 16.1: Vortrag

Montag, 8. März 2004, 16:45–17:00, H2

Vortex Loop Percolation in XY and Ginzburg-Landau Model — •Axel Krinner, Elmar Bittner, and Wolfhard Janke — Institut für Theoretische Physik, Universität Leipzig, Augustusplatz 10/11, 04109 Leipzig, Germany

We study the geometrically defined vortex network in the vicinity of the critical point in the XY and Ginzburg-Landau model. Using high-precision Monte Carlo techniques we consider the alternative formulation of the geometrical excitations in relation to the global O(2)-symmetry breaking, and check if both of them exhibit the same critical behaviour leading to a consistent description of the phase transition. Different percolation observables are taken into account and compared with each other.