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Claude Cohen Tannoudji

Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

Ses travaux sont à la source des recherches actuelles de l'IFRAF.



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

Supercritical superfluid and vortex unbinding following a quantum quench

Jeudi 25 mars 2010 à 10h00 à l’Institut d’Optique en salle S2.11 (côté école)

Séminaire de Ludwig Mathey du Joint Quantum.

Résumé

The technological advances of trapping and manipulating ultra-cold atom systems provide an opportunity to study many-body dynamics with unprecedented clarity. Here 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. We find that 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. This process can be described using a novel time-dependent renormalization group approach.


Atom Optics group
Laboratoire Charles Fabry de l’Institut d’Optique
Campus Polytechnique
2, avenue Augustin Fresnel
F-91127 Palaiseau cedex - France