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Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum gases: Bosons, mixtures and spinor gases

Q 12.5: Talk

Monday, March 17, 2014, 15:00–15:15, UDL HS2002

Superfluid Quantum Turbulence in 2D from Gauge/Gravity Duality — •Andreas Samberg1,2, Markus Karl1,2, Thomas Gasenzer1,2, and Carlo Ewerz1,21Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany

We employ the gauge/gravity duality to study the non-equilibrium physics of a strongly interacting superfluid in two dimensions, such as liquid helium or ultracold Bose gases. By mapping the superfluid state to a classical gravitational system in a higher-dimensional black hole spacetime (the so-called ‘holographic superconductor’), we get a nonperturbative handle on the quantum dynamics beyond meanfield. This method naturally incorporates the coupling of the superfluid to the thermal normal component. We numerically solve the higher-dimensional equations of motion, starting from a far-from-equilibrium state dual to a regular lattice of vortices. We present results indicating the occurrence of a quasi-stationary turbulent state, paying special attention to vortex–antivortex correlations. We discuss our results in terms of nonthermal fixed points. The kinetic energy spectrum exhibits scaling behavior Ekink−ζ with an exponent ζ∼ −5/3, the hallmark of Kolmogorov scaling.

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