Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics V
Q 62.62: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal
Phases of cold atoms interacting via photon-mediated long-range forces — •Francesco Rosati1, Tim Keller1,2, Simon B. Jäger1, and Giovanna Morigi1 — 1Universität des Saarlandes, D-66123 Saarbrücken, Germany — 2Okinawa Institute of Science and Technology Graduate University, Onna-son, Okinawa 904-0495, Japan
When directly pumping an atomic ensemble trapped in a crossed-cavities set up, atomic self-organization can occur via the interaction mediated by the photons. In this work we first derive a Fokker-Planck equation for simulating the atomic evolution in the semi-classical approximation assuming that the photons' time scale for reaching the steady state is much faster than the atomic one.
Then we numerically investigate how this system self-organise in the two cavities; moreover we show that in a two-mode standing-wave cavity the stationary state possesses the same properties and phases of the Generalized Hamiltonian Mean Field model in the canonical ensemble. This model has three equilibrium phases: a paramagnetic, a nematic, and a ferromagnetic one, which here correspond to different spatial orders of the atomic gas and can be detected by means of the light emitted by the cavities.