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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)

Q 25.65: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Kármán vortex streets in a dissipative superfluid — •Georg Trautmann¹, Gregor Bals^2,3, Thomas Gasenzer^1,2,3, Carlo Ewerz^2,3, and Davide Proment^3,4,5 — ¹Kirchhoff-Institut für Physik, Uni Heidelberg — ²Institut für Theoretische Physik, Uni Heidelberg — ³ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung — ⁴School of Engineering, Mathematics and Physics, University of East Anglia, Norwich Research Park — ⁵Centre for Photonics and Quantum Science, University of East Anglia

Moving an obstacle potential in a two-dimensional Bose-Einstein condensate can lead, depending on the potential’s size and velocity, to different phases of vortex shedding. Of particular interest is the formation of a long-lived alternating series of vortex pairs with the same winding number, similar to the Bérnard-von Kármán vortex street known from classical fluid dynamics. Furthermore, simulating the vortex dynamics in a dissipative framework allows one to compare observations to a holographic superfluid where the strongly correlated quantum system is modeled through a higher-dimensional, weakly coupled gravitational theory. Recent literature has already shown successfully that the trajectories of simple vortex configurations simulated by dissipative Gross-Pitaevskii equations can be matched to the holographic analog. On the experimental side, the strongly dissipative quantum fluid can also describe liquid helium close to the lambda-transition qualitatively. Additionally, strong dissipation gives rise to further phases of vortex shedding that are not present in the non-dissipative condensate.

Keywords: Ultracold Quantum Gases; Far-from-equilibrium Dynamics; Holographic Superfluids