Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

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

Q 25.52: Poster

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

Experimental Study of the Solidity and Smecticity of a Driven Superfluid — •Nikolas Liebster, Marius Sparn, Elinor Kath, Jelte Duchene, Helmut Strobel, and Markus Oberthaler — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

Bosonic quantum gases have been shown to result in spontaneously arising, self-stabilized periodic density modulations when the two-particle interaction strength is driven in time. Here we experimentally demonstrate that such states share key properties to a seemingly different physical system, namely supersolids, not only in their superfluidity and periodic density structure but also in their excitations. This correspondence is made possible through the effective theory of hydrodynamics of supersolids, which is constructed using assumptions of spontaneously broken symmetries and conserved quantities. We experimentally investigate both stripe patterns as well as two-dimensional crystals, using novel techniques to instigate sound modes in each configuration.

Keywords: Superfluids; Driven Systems; Supersolids; Pattern Formation