Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.3: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Engineering scaling laws: What to learn from driven quantum turbulence — •Fabian Brock1,3, Markus Karl1,2,3, and Thomas Gasenzer2,3 — 1Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany — 3Kirchhoff-Institut für Physik, INF 227, 69120 Heidelberg, Germany
We investigate the long-standing issue of driven quantum turbulence in a Bose–Einstein condensate from a new perspective. Having the recently developed concept of non-thermal fixed points in mind, we study the response of a Bose gas in two spatial dimensions to a power-law shaped stochastic driving force. Two classes of non-equilibrium steady states are found, depending on the ability of the system to form quantum vortices. We show that, if vortex formation is suppressed, a turbulent steady state with a freely adjustable scaling law in the energy distribution emerges. We present numerical evidence that the driven-dissipative Bose gas is then part of the Kardar-Parisi-Zhang dynamic universality class. On the other hand, if vortex proliferation is allowed, a completely different scenario applies where the system is, irrespective of the driving force, attracted by one universal fixed point.