Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.38: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Nonthermal fixed points and superfluid turbulence in 2D ultracold Bose gases — •Fabian Brock1,2, Simon Sailer1,2, Markus Karls1,2, and Thomas Gasenzer1,2 — 1Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg — 2Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg
The behavior of turbulent one-component Bose-Einstein condensates is studied by simulations of the driven-dissipative Gross-Pitaevskii equation and free expansion dynamics. The aspect ratio during free expansion is studied using the GPE and a hydrodynamic model based on Eulers equations. By comparison to non-turbulent systems, this gives insight into the influence of vorticity on the expansion dynamics. The results aim to help the study of superfluid turbulence in experiment by measuring the gas after some given expansion time and drawing inferences on its initial state. In the driven-dissipative case, non-thermal fixed points far away from equilibrium are studied. Power laws in the occupation number are numerically determined by vortex statistics and compared to analytical results.