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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Milena Horvath & Sudipta Dhar & Arpita Das & Matthew D. Frye & Yanliang Guo & Jeremy M. Hutson & Manuele Landini & Hanns-Christoph Nägerl, 2024. "Bose-Einstein condensation of non-ground-state caesium atoms," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47760-0
    DOI: 10.1038/s41467-024-47760-0
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