We have characterized the scattering properties of ultracold E. Lucioni, et al. |

Welcome to the website of the Ultracold Quantum Gases group at the European Laboratory for Nonlinear Spectroscopy (LENS) and Department of Physics and Astronomy of the University of Florence (Italy). In our labs we use lasers and magnetic fields to produce the lowest temperatures of the Universe, just a few billionths of a degree above absolute zero...

At these temperatures, atoms stop moving and we can control them for a variety of different fundamental studies and applications. We can force atoms to arrange according to a periodic structure and simulate the behavior of crystalline solids and new materials. We can use the atoms as ultra-high accurate sensors to probe forces with the power of quantum mechanics. We can study how quantum particles combine together under the action of strong interactions and how superfluidity develops. We can use these ultracold atoms to process information and develop new quantum technologies.

Dress warmly and... follow us for this ultracold journey!

We have characterized the scattering properties of ultracold E. Lucioni, et al. |

We report on the observation of quantum liquid droplets in a bosonic mixture. While ultracold atomic systems are commonly found in a gas phase, recent theoretical and experimental results have surpringly pointed out that under special circumstances condensed atoms can form self-bound liquid-like droplets. At the origin of this new phase is the coexistence of repulsive and attractive forces that perfectly balance to generate the self-binding mechanism. The two competing energies are provided by the mean-field interaction and the first beyond mean-field correction, the so-called Lee-Huang-Yang term. We observe the existence of such self-bound ensembles in a bosonic mixture of K-39 atoms and we characterize their equilibrium properties. Quantum droplets are predicted to be macroscopic zero-temperature objects, due to their peculiar energy spectrum, where no discrete modes are expected below the particle emission threshold. The observation reported in this work certainly opens the way to further studies of the exotic properties of this new phase, which also constitutes the only known quantum liquid together with helium nanodroplets. G. Semeghini, et al., |

We have realized a double-species Bose-Einstein Condensate of |

We have finalized the construction of the experimental setup, and we're now able to produce the first Lithium-Chromium MOT worldwide! Fun has just begun! |

Fermi Colloqium by Prof. Wolfgang Ketterle:

*New forms of matter with ultracold atoms: superfluids, supersolids and more*,

h. 11.30 Querzoli room, LENS.

h. 11.30 Querzoli room, LENS.

Prof. Wolfgang Ketterle will give a lecture for students and everyone else interested on the topic:

*Superfluid Bose and Fermi gases*,

h. 15.00 Room 25, Blocco Aule.

h. 15.00 Room 25, Blocco Aule.

Seminar by Prof. Arno Rauschenbeutel:

*Chiral Quantum Optics*,

h. 11.00 Querzoli room, LENS.

h. 11.00 Querzoli room, LENS.

Seminar by Prof. Maarten Hoogerland:

*Atomtronics and cavity QED experiments in Auckland*,

h. 11.30 Querzoli room, LENS.

h. 11.30 Querzoli room, LENS.

The LENS QuantumGases group is glad to welcome in Florence Prof. Randall Hulet from Rice University. Prof. Hulet will be our guest for one month until mid July.

Seminar by Prof. Nick Proukakis:

*Non-Equilibrium Dynamics in Quantum Gases*,

h. 11.00 Querzoli room, LENS.

h. 11.00 Querzoli room, LENS.

Seminar by Prof. David Clément:

*Momentum-resolved investigation of the condensate depletion in interacting Bose gases*,

h. 15.00 Querzoli room, LENS.

h. 15.00 Querzoli room, LENS.

Seminar by Dr. Carmine Ortix:

*Symmetry-protected topological insulators in one-dimension*,

h. 12.00 Querzoli room, LENS.

h. 12.00 Querzoli room, LENS.