Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.17: Poster

Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal

Many-body phases of fermions coupled to an optical waveguide — •Kieran Fraser and Francesco Piazza — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Ultracold atoms subject to a single cavity mode will, above a threshold pump strength, undergo a self-organisation transition, related to so-called superradiance. A similar effect is observed for atoms in the evanescent field of an optical fibre. We study the phase diagram and collective excitations of a degenerate Fermi gas coupled to the propagating modes of a multimode optical waveguide. The interplay between superradiant and Umklapp scattering gives rise to a rich phase diagram and to peculiar collective excitations.