Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum gases (Bosons) III

Q 17.7: Talk

Tuesday, March 10, 2020, 15:30–15:45, e214

Superradiant multimode Floquet polaritons — •Christian Johansen, Johannes Lang, and Francesco Piazza — Max Planck Institut für Physik Komplexer Systeme

Optically trapped driven ultracold atoms in cavities present a highly tunable system for exploring many-body physics. Using near-planar cavities the transversal modes (TMs) are typical distanced by several hundreds megahertz. As such the atoms will dominantly interact only with the resonant TM of the cavity. This interaction between atoms and the cavity gives rise to the well known superradiant instability. New confocal experimental setup have shown that when multiple modes becomes relevant then the nature of the unstable mode changes. In this project we theoretically investigate a system where the pump laser's phase is periodically modulated. This modulation puts higher-order transversal modes closer to resonance in a way that is easily implemented in current near-planar cavity setups Using non-equilibrium field theory we find that this modulation affects both the threshold of the instability and the unstable mode's nature.