Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Poster II
Q 24.14: Poster
Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer
Dynamical phases emerging from light-mediated interaction — •Anton Bölian1, Phatthamon Kongkhambut1, Jim Skulte1, Ludwig Mathey1, Jayson G. Cosme3, Hans Keßler2, and Andreas Hemmerich1 — 1Zentrum für Optische Quantentechnologien and Institut für Quantenphysik, Universität Hamburg, Germany. — 2Physikalisches Institut der Universität Bonn, Germany. — 3National Institute of Physics, University of the Philippines, Diliman, Quezon City, Philippines.
We are experimentally exploring the light-matter interaction of a Bose-Einstein condensate (BEC) with a single light mode of an ultra-high finesse optical cavity. The key feature of our cavity is the very small field decay rate (κ/2π = 3.5 kHz), which is in the order of the recoil frequency (ωrec/2π = 3.6 kHz). This leads to a unique situation of a recoil-resolved cavity. Pumping the system with a steady state light field, red detuned with respect to the atomic resonance, the Dicke model is implemented including the self-organisation phase transition. Starting in the self-ordered superradiant phase and modulating the amplitude of the pump field, we observe a dissipative discrete time crystal, whose signature is a robust subharmonic oscillation between two symmetry-broken states. Modulation of the phase of the pump field gives rise to an incommensurate time crystalline behaviour. For a blue-detuned pump light with respect to the atomic resonance, we observe limit cycles (LCs). Since the pump protocol is time-independent, the emergence of LCs demonstrates the breaking of continuous time-translation symmetry.
Keywords: Open Quantum Systems; Hybrid Quantum Systems; Cavity QED; BEC