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Dicke quantum phase transition with a superfluid gas in an optical cavity

The Dicke quantum phase transition is realized in an open system formed by a Bose–Einstein condensate coupled to an optical cavity, and the emergence of a self-organized supersolid phase is observed.
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Cold atoms in cavity-generated dynamical optical potentials

We review state-of-the-art theory and experiment of the motion of cold and ultracold atoms coupled to the radiation field within a high-finesse optical resonator in the dispersive regime of the…
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Experiments with density currents on a sloping bottom in a rotating fluid

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Exploring symmetry breaking at the Dicke quantum phase transition.

The process of symmetry breaking in the presence of a small symmetry-breaking field is explored and its dependence on the rate at which the critical point is crossed is studied.
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Removal of violations of the Master Ward Identity in perturbative QFT

We study the appearance of anomalies of the Master Ward Identity, which is a universal renormalization condition in perturbative QFT. The main insight of the present paper is that any violation of…
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Cavity Optomechanics with a Bose-Einstein Condensate

A cavity optomechanical system in which a collective density excitation of a Bose-Einstein condensate serves as the mechanical oscillator coupled to the cavity field, and the results open up new directions for investigating mechanical oscillators in the quantum regime and the border between classical and quantum physics.
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Cavity QED with a Bose–Einstein condensate

A conceptually new regime of cavity QED is achieved, in which all atoms occupy a single mode of a matter-wave field and couple identically to the light field, sharing a single excitation, which opens possibilities ranging from quantum communication to a wealth of new phenomena that can be expected in the many-body physics of quantum gases with cavity-mediated interactions.
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Roton-Type Mode Softening in a Quantum Gas with Cavity-Mediated Long-Range Interactions

The excitation spectrum of a Bose-Einstein condensate with cavity-mediated long-range interactions, which couple all particles to each other is investigated, finding a minimum was observed in the excitation energy, similar to that observed in roton excitations of the superfluid helium.
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Real-time observation of fluctuations at the driven-dissipative Dicke phase transition

Using a dissipation channel to nondestructively gain information about a quantum many-body system provides a unique path to study the physics of driven-dissipative systems.
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Measuring the dynamic structure factor of a quantum gas undergoing a structural phase transition

This work reports on a direct, real-time and nondestructive measurement of the dynamic structure factor of a quantum gas exhibiting cavity-mediated long-range interactions, and provides a theoretical description of this dissipative quantum many-body system.
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