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Q: Fachverband Quantenoptik und Photonik
Q 51: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)
Q 51.6: Vortrag
Donnerstag, 5. März 2026, 12:30–12:45, N 1
Exploring dynamic properties of finite-temperature Bose-Einstein condensed bubbles in microgravity — •Brendan Rhyno1, Timothé Estrampes1,2, Charles Garcion1, Zain Mehdi3, Abel Beregi4, Jean-Baptiste Gerent4, Nathan Lundblad4, Kuei Sun5, Smitha Vishveshwara6, and Naceur Gaaloul1 — 1Leibniz Universität Hannover — 2Université Paris-Saclay — 3Australian National University — 4Bates College — 5Washington State University — 6University of Illinois at Urbana-Champaign
Since the first observation of ultracold bosonic bubbles with the Cold Atom Lab (CAL) aboard the International Space Station, interest in the structure and properties of Bose-Einstein condensate (BEC) bubbles has grown steadily. Motivated by ongoing CAL operations and upcoming microgravity experiments using the Einstein-Elevator at the Leibniz University of Hannover, we discuss our efforts to model the dynamic properties of quantum bubbles. Starting from an initial thermal state, we develop a formalism to compute n-point correlation functions while varying the shell radius and thickness, utilizing an isotropic `bubble trap' potential. In the ultra-dilute limit, we study nonequilibrium expansions and contractions of the system in the vicinity of the BEC phase transition. In the ultra-thin spherical-shell limit, we develop Bogoliubov techniques for computing nonequilibrium correlators. We conclude by highlighting the relevance of our results to ongoing experimental efforts.
Keywords: BEC; Quantum bubbles; Shell-shaped condensates; nonequilibrium; thermodynamics