Taming, slowing and trapping atoms with light
Cold is quantum, Quantum is cool!
Multicolored lasers for a variety of different atoms
Keeping our eyes on the quantum
High technology for great science
Join our ultracool group!

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!

LAST NEWS

We report the experimental observation of a lensing effect on a Bose-Einstein condensate expanding in a moving 1D optical lattice. The effect of the periodic potential can be described by an effective mass dependent on the condensate quasimomentum. By changing the velocity of the atoms in the frame of the optical lattice, we induce a focusing of the condensate along the lattice direction. The experimental results are compared with the numerical predictions of an effective 1D theoretical model. In addition, a precise band spectroscopy of the system is carried out by looking at the real-space propagation of the atomic wave packet in the optical lattice.

L. Fallani et al.
Optically Induced Lensing Effect on a Bose-Einstein Condensate Expanding in a Moving Lattice
Phys. Rev. Lett. 91, 240405 (2003)

We investigate the properties of a coherent array containing about 200 Bose-Einstein condensates produced in a far detuned 1D optical lattice. The density profile of the gas, imaged after releasing the trap, provides information about the coherence of the ground-state wave function. The measured atomic distribution is characterized by interference peaks. The time evolution of the peaks, their relative population, as well as the radial size of the expanding cloud are in good agreement with the predictions of theory.

P. Pedri et al.
Expansion of a Coherent Array of Bose-Einstein Condensates
Phys. Rev. Lett. 87, 220401 (2001)

We report on the direct observation of an oscillating atomic current in a one-dimensional array of Josephson junctions realized with an atomic Bose-Einstein condensate. The array is created by a laser standing wave, with the condensates trapped in the valleys of the periodic potential and weakly coupled by the interwell barriers. The coherence of multiple tunneling between adjacent wells is continuously probed by atomic interference. The square of the small-amplitude oscillation frequency is proportional to the microscopic tunneling rate of each condensate through the barriers and provides a direct measurement of the Josephson critical current as a function of the intermediate barrier heights.

F. S. Cataliotti et al.
Josephson Junction Arrays with Bose-Einstein Condensates
Science 293, 843 (2001)

Last Tweets

Seminars & Events

13.06.2017
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.
20 & 21.04.2017
QUIC Project Meeting
See detailed program
Querzoli room, LENS.
10.04.2017
Seminar by Prof. Nick Proukakis:
Non-Equilibrium Dynamics in Quantum Gases,
h. 11.00 Querzoli room, LENS.
23.02.2017
Seminar by Prof. David Clément:
Momentum-resolved investigation of the condensate depletion in interacting Bose gases,
h. 15.00 Querzoli room, LENS.
22.02.2017
Seminar by Dr. Carmine Ortix:
Symmetry-protected topological insulators in one-dimension,
h. 12.00 Querzoli room, LENS.
08.02.2017
Trento-Florence Joint Meeting on Cold Matter
Polo Scientifico di Povo, Trento.
24.01.2017
Seminar by Dr. Franck Pereira Dos Santos:
Cold Atom Interferometry Gravity Sensors,
h.15.15 Querzoli room, LENS.
20.01.2017
Seminar by Andrea Morales:
Supersolid formation in a quantum gas breaking a continuous translational symmetry,
h.15.15 Querzoli room, LENS.
20.01.2017
Seminar by Prof. Jean-Philippe Brantut:
Mesoscopic transport experiments with cold atoms,
h. 11.00 Querzoli room, LENS.
19.12.2016
Seminar by Dr. Guido Pagano:
Observation of a Discrete Time Crystal in a Trapped-Ion Quantum Simulator,
h. 16.30 Querzoli room, LENS.
10.10.2016
Seminar by Dr. Francesco Piazza:
Spontaneous Crystallisation of Light and Ultracold Atoms,
h. 15.00 Querzoli room, LENS.
16.09.2016
Fermi Colloquim by Prof. Jun Ye:
Optical atomic clock and many-body quantum physics,
h. 11.30 Querzoli room, LENS.