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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.6: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG2

Cavity-induced supersolidity and its elementary excitations — •Philip Zupancic, Julian Leonard, Andrea Morales, Tilman Esslinger, and Tobias Donner — ETH Zürich, Zürich, Schweiz

We report on the first coupling of a Bose-Einstein condensate to two optical cavities. The combination of self-organisation processes with discrete symmetries in each cavity gives rise to one enhanced, continuous symmetry. When this U(1) symmetry is broken, a supersolid emerges -- a state of matter that is both crystalline and superfluid. We provide evidence for both key properties. The light fields leaking from the cavities allow real-time observation of crystal movements. We investigate the mode spectrum of our supersolid phase and present measurements on the mode softening at the phase transition and the paired Nambu-Goldstone/amplitude modes inside the phase.