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Q: Fachverband Quantenoptik und Photonik

Q 52: Quantum Gases (Bosons) V

Q 52.1: Vortrag

Donnerstag, 14. März 2019, 14:00–14:15, S HS 037 Informatik

Self-organization of a BEC with competing polarizations — •Xiangliang Li, Andrea Morales, Alexander Baumgärtner, Philip Zupancic, Davide Dreon, Tobias Donner, and Tilman Esslinger — ETH Zürich, Switzerland

The coupling of a transversally pumped Bose-Einstein condensate (BEC) with a single optical cavity mode is known to exhibit a self-ordered phase with superradiant scattering of the photons into the cavity. Coupling BECs with multiple optical cavity modes is predicted to drive intriguing phases and realize novel quantum matter.

In our recent experiment, a BEC of 87Rb is placed inside the mode of a birefringent optical cavity and pumped transversally by a linearly polarized optical lattice. The scalar and vectorial atom-light couplings with the two polarization modes drive superradiant phase transitions into these two modes, respectively. Moreover, the coupling to one of the two modes can be controlled by changing the orientation of a magnetic field in space. We characterize the system by measuring the phase diagram for different magnetic field configurations, and provide a theoretical model.