Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Ultra-cold atoms, ions and BEC I (joint session A/Q)
Q 16.5: Talk
Monday, March 10, 2025, 18:15–18:30, KlHS Mathe
Engineering quantum droplet formation by cavity-induced long-range interactions — •Leon Mixa1,2, Milan Radonjić1,3, Axel Pelster4, and Michael Thorwart1,2 — 1I. Institut für Theoretische Physik, Universität Hamburg, Germany — 2The Hamburg Center for Ultrafast Imaging, Germany — 3Institute for Physics Belgrade, University of Belgrade, Serbia — 4Phyisics Department and Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Germany
We investigate a dilute Bose gas with both a short-range contact and an effective long-range interaction between the atoms. The latter is induced by the strong coupling to a cavity light mode and is spatially characterized by a periodic signature and a tunable envelope rooted in the pumping of the cavity. We formulate a Bogoliubov theory which is based on a homogeneous mean-field description and quantum fluctuations around it. We find that the repulsive mean-field contact interaction could be destabilized by quantum fluctuation corrections rooting in the long-range interaction. The competition between both allows for the formation of self-bound quantum droplets. We show analytically how the size and the central density of the cavity-induced quantum droplets depend on the contact interaction strength and on the shape of the spatial envelope of the long-range interaction [arXiv:2409.20072, 2409.18215].
Keywords: Quantum droplet; Cavity BEC; Long-range interactions