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Q: Fachverband Quantenoptik und Photonik
Q 26: Quantum Gases: Bosons III
Q 26.6: Talk
Wednesday, March 8, 2023, 12:15–12:30, E214
Condensate formation in a dark state of a driven atom-cavity system — •Jim Skulte1,2, Phatthamon Kongkhambut1, Hans Keßler1, Jayson G. Cosme3, Andreas Hemmerich1,2, and Ludwig Mathey1,2 — 1Zentrum für Optische Quantentechnologien and Institut für Laser-Physik, Universität Hamburg, 22761 Hamburg, Germany. — 2The Hamburg Center for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany. — 3National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines.
An intriguing class of quantum states in light-matter systems are the so-called dark states. We demonstrate condensate formation in a dark state in an ultracold quantum gas coupled to a high-finesse cavity and pumped by a shaken optical lattice [1]. We show experimentally and theoretically that the atoms in the dark state display a strong suppression of the coupling to the cavity. On the theory side, this is supported by solving the dynamics of a minimal three-level model [2] and of the full atom-cavity system. The symmetry of the condensate wave function is anti-symmetric with respect to the potential minima of the pump lattice, and displays a staggered sign along the cavity direction. This symmetry decouples the dark state from the cavity, and is preserved when the pump intensity is switched off.
[1] J. Skulte et al., Condensate formation in a dark state of a driven atom-cavity system, arXiv:2209.03342 (2022)
[2] J. Skulte et al., Parametrically driven dissipative three-level Dicke model, PRA 127, 253601 (2021)