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Q: Fachverband Quantenoptik und Photonik

Q 7: Poster I

Q 7.27: Poster

Montag, 6. März 2023, 16:30–19:00, Empore Lichthof

Onset of atomic selforganization in optical cavities: from quantum to thermal momentum distributions — •Tarek Moussa, Simon B. Jäger, Imke Schneider, and Sebastian Eggert — Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, D-67663, Kaiserslautern, Germany

We theoretically study the dynamics of transversally driven atoms coupled to a single-mode optical cavity. The atoms spontaneously form a structured pattern above a critical driving strength. This pattern formation is known as atomic selforganization and results in a Bragg grating of the atoms which supports constructive interference of scattered laser photons. We study this threshold using a mean-field treatment and as a function of the initial temperature of the atomic cloud. Below threshold, we analyze the response of the atomic gas which we find to be fundamentally different in the low and high temperature regimes. For thermal energies much lower than the photon recoil energy we find long-lived coherent oscillations. Instead, for thermal energies well above the recoil energy we find that all fluctuations are strongly damped. Using this insight, we explore the importance of thermal fluctuations regarding resonant parametric amplification realized by a time-periodic modulation of the driving strength.