Partenaires

CNRS
UPS



Rechercher

Sur ce site

Sur le Web du CNRS


Accueil du site > Séminaires > Séminaires 2010 > Supercritical superfluid and vortex unbinding following a quantum quench

mardi 2 février 14h00

Supercritical superfluid and vortex unbinding following a quantum quench

Ludwig Matthey (NIST, Gaithersburg)

par Pierre Pujol - 2 février 2010

We study the dynamics of the relative phase of a bilayer of two-dimensional superfluids after the two superfluids have been decoupled, using truncated Wigner approximation. On short time scales the relative phase shows "light-cone"-like thermalization and creates a metastable superfluid state, which can be supercritical. On longer time scales this state relaxes to a disordered state due to dynamical vortex unbinding. This scenario of dynamically suppressed vortex proliferation constitutes a reverse-Kibble-Zurek effect. We observe dynamics of creation of vortex-antivortex pairs and their consequent motion. Our predictions can be directly measured in interference experiments.