Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Gases I
Q 20.4: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Shell-shaped dual-component BEC mixtures — •Alexander Wolf1, Patrick Boegel2, Matthias Meister1, Antun Balaž3, Naceur Gaaloul4, and Maxim Efremov1,2 — 1Institute of Quantum Technologies, German Aerospace Center (DLR), 89077 Ulm, Germany — 2Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, 89081 Ulm, Germany — 3Institute of Physics Belgrade, University of Belgrade, 11080 Belgrade, Serbia — 4Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
Since the launch of NASA’s Cold Atom Lab there have been ongoing efforts to create shell-shaped Bose-Einstein condensates (BECs) in microgravity. The experimental realization is based on radio-frequency (rf) dressing which, however, is intrinsically sensitive to typical inhomogeneities of the involved magnetic fields. A fully closed shell of Bose-Einstein condensed atoms is therefore yet to be created.
Motivated by this experimental challenge, we propose an alternative approach [1] based on dual-component BEC mixtures where one component forms a shell around the other due to a repulsive inter-component interaction. We find that the mixture shows similar signatures in its collective excitation spectrum at the transition between a filled sphere and a hollow sphere as the rf-dressed BEC but offers additional benefits such as the conservation of the shell structure during the free expansion dynamics.
[1] A. Wolf et al. arXiv 2110.15247 (2021).