Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 7: Poster I

DY 7.7: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Depletion of Superfluidity in a disordered non-equilibrium Quantum Condensate — •Alexander Janot¹, Timo Hyart², Bernd Rosenow¹, and Paul Eastham³ — ¹Institut für Theoretische Physik, Universität Leipzig, 04009 Leipzig, Germany — ²Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, Netherlands — ³School of Physics, Trinity College, Dublin 2, Ireland

Observations of quantum coherence in driven systems, e.g. polariton condensates, have strongly stimulated experimental as well as theoretical efforts during the last decade. We analyze the superfluid stiffness of a non-equilibrium quantum-condensate in a disordered environment taking gain and loss of particles into account. To this end a modified effective Gross-Pitaevskii equation is employed. We find that the disorder-driven depletion of superfluidity is strongly enhanced due to the gain-loss mechanism. It turns out that the condensate remains stiff at finite length scales only.