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The Dicke Quantum Phase Transition and Supersolidity

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If you have a question about this talk, please contact Leona Hope-Coles .

It is an almost magic toolbox, which has been created around quantum gas experiments. This toolbox includes bosons, fermions, weak and strong interactions, low-dimensional systems, optical lattices and more. Yet, the observed physics has been governed by short ranged interactions between the particles. In this talk, I will report on an experiment in which we have succeeded in creating a quantum gas with infinitely long-ranged interactions. The interactions are mediated by an optical cavity. We observe a phase transition from a superfluid into a self-organized state with a broken spatial symmetry, which can be regarded as a supersolid phase. This observation is a realization of the Dicke quantum phase transition which has been predicted more than 30 years ago, but has never been realized in an experiment.

This talk is part of the Cavendish Physical Society series.

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