Published October 4, 2023
| Version One
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Bose-Einstein condensation of non-ground state caesium atoms
Authors/Creators
- 1. Institut fur Experimentalphysik und Zentrum fur Quantenphysik, Universitat Innsbruck, Technikerstrasse 25, Innsbruck, 6020, Austria
- 2. Department of Chemistry and Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, Durham DH1~3LE, United Kingdom
Description
We report the Bose-Einstein condensation of caesium atoms in the Zeeman-excited
mf = 2 state. As the magnetic field is varied, we identify two regions in which the
dipolar relaxation rate is sufficiently suppressed so that condensation becomes possible.
We characterize the phase transition and quantify the loss processes, finding unusually
high three-body losses in one of the two regions. Our experimental results otherwise
agree well with the theoretical expectation. In particular, we confirm the presence of
a narrow Feshbach resonance near a zero crossing in the background scattering length.
Our results open up new possibilities for the mixing of quantum-degenerate gases and
the study of impurity transport in strongly correlated one-dimensional quantum wires.
Notes
The Innsbruck team acknowledges funding by:
a Wittgenstein prize grant under the Austrian Science Fund's (FWF) project number Z336-N36 and
by the European Research Council (ERC) under project number 789017.
MH thanks the doctoral school ALM for hospitality, with funding from the FWF under the project number W1259-N27.
The theoretical work was supported by:
the U.K. Engineering and Physical Sciences Research Council (EPSRC) Grant Nos. EP/P01058X/1, EP/V011677/1 and EP/W00299X/1
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