Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 12: Ultra-cold atoms, ions and BEC

A 12.16: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

A dipolar quantum gas of Dysprosium: superfluidity and droplets — •Mingyang Guo, Fabian Böttcher, Jan-Niklas Schmidt, Matthias Wenzel, Tim Langen, Julian Kluge, Viraatt Anasuri, Jens Hertkorn, Arup Bhomwick, and Tilman Pfau — 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart

Ultracold dipolar gases have great potential to realize novel quantum many-body phases arising from the long-range and anisotropic dipolar interactions, distinct from the mostly studied contact interaction. The existence of strongly dipolar interactions directly induce modifications to the superfluid properties, including the anisotropic critical velocities and collective excitations.

Furthermore, tuning the contact interaction weaker than the dipolar interaction, we observed formation of quantum droplets instead of collapse, predicted by the mean-field theory, due to the corrections from quantum fluctuations. By changing the external confinement, we can realize droplet arrays as well as a single self-bound droplet. The self-bound droplets possess saturated peak densities and small compressibility, similar to the properties of classical fluids. The critical atom number for the self-bound droplets is also measured over a wide range of scattering length with almost an order change of the critical number.