Quantum-Fluctuation-driven crossover from a dilute bose-einstein condensate to a macrodroplet in a dipolar quantum fluid

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Chomaz, L.; Baier, S.; Petter, D.; Mark, M.J.; Wächtler, F. et al.: Quantum-Fluctuation-driven crossover from a dilute bose-einstein condensate to a macrodroplet in a dipolar quantum fluid. In: Physical Review X 6 (2016), Nr. 4, 41039. DOI: https://doi.org/10.1103/PhysRevX.6.041039

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Abstract: 
In a joint experimental, theoretical effort, we report on the formation of a macrodroplet state in an ultracold bosonic gas of erbium atoms with strong dipolar interactions. By precise tuning of the s-wave scattering length below the so-called dipolar length, we observe a smooth crossover of the ground state from a dilute Bose-Einstein condensate to a dense macrodroplet state of more than 2 × 104 atoms. Based on the study of collective excitations, loss features, we prove that quantum fluctuations stabilize the ultracold gas far beyond the instability threshold imposed by mean-field interactions. Finally, we perform expansion measurements, showing that although self-bound solutions are prevented by losses, the interplay between quantum stabilization, losses results in a minimal time-of-flight expansion velocity at a finite scattering length.
License of this version: CC BY 3.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 139 95.21%
2 image of flag of United States United States 2 1.37%
3 image of flag of Philippines Philippines 1 0.68%
4 image of flag of Kenya Kenya 1 0.68%
5 image of flag of India India 1 0.68%
6 image of flag of China China 1 0.68%
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