Bose-Einstein condensation of non-ground-state caesium atoms

Milena Horvath, Sudipta Dhar, Arpita Das, Matthew D. Frye, Yanliang Guo, Jeremy M. Hutson, Manuele Landini and Hanns-Christoph Nägerl ()
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Milena Horvath: Universität Innsbruck
Sudipta Dhar: Universität Innsbruck
Arpita Das: Department of Physics, Durham University
Matthew D. Frye: Durham University
Yanliang Guo: Universität Innsbruck
Jeremy M. Hutson: Durham University
Manuele Landini: Universität Innsbruck
Hanns-Christoph Nägerl: Universität Innsbruck

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Bose-Einstein condensates of ultracold atoms serve as low-entropy sources for a multitude of quantum-science applications, ranging from quantum simulation and quantum many-body physics to proof-of-principle experiments in quantum metrology and quantum computing. For stability reasons, in the majority of cases the energetically lowest-lying atomic spin state is used. Here, we report the Bose-Einstein condensation of caesium atoms in the Zeeman-excited mf = 2 state, realizing a non-ground-state Bose-Einstein condensate with tunable interactions and tunable loss. We identify two regions of magnetic field in which the two-body relaxation rate is low enough that condensation is possible. We characterize the phase transition and quantify the loss processes, finding unusually high three-body losses in one of the two regions. Our results open up new possibilities for the mixing of quantum-degenerate gases, for polaron and impurity physics, and in particular for the study of impurity transport in strongly correlated one-dimensional quantum wires.

Date: 2024
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DOI: 10.1038/s41467-024-47760-0

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