Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Long-range Interactions

Q 42.3: Talk

Thursday, March 14, 2024, 11:45–12:00, HS 1015

Cavity induced quantum droplets — •Leon Mixa¹, Milan Radonjić^1,2, Axel Pelster³, and Michael Thorwart¹ — ¹I. Institute of Theoretical Physics, Universität Hamburg, Germany — ²Institute of Physics Belgrade, University of Belgrade, Serbia — ³Physics Department and Research Center OPTIMAS, University Kaiserslautern-Landau, Germany

Quantum droplets are formed in an interacting atom gas when quantum fluctuations stabilize the gas mechanically which would otherwise be unstable. Subjecting a condensate to interaction with a cavity is known to strongly couple the atomic and cavity fluctuations, creating long-range interactions and roton-like modes. We study the formation of quantum droplets in a three-dimensional homogeneous Bose-Bose mixture placed in an optical cavity. The internal transitions of the atoms are off-resonantly pumped by a beam transversal to the cavity axis. We find that cavity fluctuations influence droplet properties, such that changing the cavity parameters can be used for droplet tuning. Furthermore, cavity fluctuations can create necessary conditions for droplet formation even in the stable mean-field region of the bare mixture.

Keywords: Cavity BEC; Quantum Droplets; Bose-Bose mixtures; Fluctuations; Cavity QED