Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Ultracold Matter (Bosons) II (joint session Q/A)

A 8.6: Vortrag

Dienstag, 11. März 2025, 12:15–12:30, HS I PI

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

In recent years, a wealth of studies have surrounded the budding field of supersolids, which are systems that are simultaneously superfluid and crystalline. A consequence of the two spontaneously broken symmetries is an enriched excitation spectrum with distinct Goldstone modes. This generic behavior can be derived hydrodynamically by considering only broken symmetries and conserved quantities. Here, we probe the hydrodynamic excitations of a superfluid with density patterns stabilized by driving the interaction strength. We probe both stripe patterns as well as two-dimensional crystals, observing propagating sound modes in each configuration. Using anisotropic response of the stripe (i.e. smectic), we experimentally determine the relevant hydrodynamic parameters. Additionally, we probe transverse sound modes of a two-dimensional crystal to investigate the symmetry breaking processes of the pattern.

Keywords: Supersolids; Driven Systems; Superfluids; Pattern Formation