Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 10: Ultra-cold Atoms, Ions and BEC I (joint session A/Q)
A 10.8: Talk
Tuesday, March 3, 2026, 12:45–13:00, N 1
Collective excitations in Quantum Bubbles — •Timothé Estrampes1,2, Brendan Rhyno1, Charles Garcion1, Ernst M. Rasel1, Éric Charron2, and Naceur Gaaloul1 — 1Leibniz University Hannover, Institut für Quantenoptik, Germany — 2Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, France
The realization of the first quantum bubbles, both in microgravity using radiofrequency dressing (Nature 606, 281-286 (2022)) and on the ground with quantum mixtures (PRL 129, 243402 (2022)), has opened the way to studying the evolution of condensed atoms in non-trivial geometries. Among these, collective excitation modes are of particular interest, as they are readily accessible experimentally. It has been shown that, during the transition from a filled to a hollow geometry, the behavior of excitation modes is non-monotonic. In this work, we investigate the behavior of collective excitations in quantum bubbles and search for potential thermodynamic signatures of the hollowing transition.
Keywords: Bose-Einstein Condensates; Quantum Bubbles; Non-trivial Geometry; Collective Excitations; Phase Transition