Tuesday, November 6, 2012

1211.0661 (Andrew Forrester et al.)

Exact Solution for Vortex Dynamics in Temperature Quenches of
Two-Dimensional Superfluids

Andrew Forrester, Han-Ching Chu, Gary A. Williams
An exact analytic solution for the dynamics of vortex pairs is obtained for rapid temperature quenches of a superfluid film starting from the line of critical points below the critical temperature $T_{KT}$. An approximate solution for quenches at and above above $T_{KT}$ provides insights into the origin of logarithmic transients in the vortex decay, and are in general agreement with recent simulations of the quenched XY model. These results confirm that there is no "creation" of vortices whose density increases with the quench rate as predicted by the Kibble-Zurek theory, but only monotonic decay of the thermal vortices already present at the initial temperature.
View original: http://arxiv.org/abs/1211.0661

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