Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 31: Ultra-cold atoms, ions and BEC IV (joint session A/Q)

A 31.4: Talk

Friday, March 18, 2022, 11:30–11:45, A-H1

Pattern formation and symmetry breaking in a periodically driven 2D BEC — •Nikolas Liebster, Celia Viermann, Maurus Hans, Marius Sparn, Elinor Kath, Helmut Strobel, and Markus Oberthaler — Kirchhoff Institut für Physik, Heidelberg, Deutschland

Dynamical pattern formation is a ubiquitous phenomenon in nature, and has relevance in many fields in physics. The emergence of these patterns, as well as how symmetries are broken, remains an open field of research in quantum physical systems. By periodically driving the scattering length in a 2D potassium-39 Bose-Einstein condensate, we use parametric resonance to non-linearly populate specific momentum modes of trapped condensates. We show the emergence of randomly oriented standing waves with D4 symmetry and investigate these structures in real and momentum space, showing the growth of both primary and secondary momentum modes. Finally, we investigate the effects of trapping geometries on the formation of patterns on the condensate.