Quantum simulations with a tunable Bose-Einstein condensate… We use BECs made of potassium-39 atoms, with interaction tunable via Feshbach resonances, to explore open problems in condensed-matter and few-body physics. Recently we have been studying quantitatively Anderson localization of non-interacting matter waves in disordered potentials, the interplay of disorder and interactions in low-dimensional systems, and superfluidity in bosonic wires.

Revealing quantum phase slips in 1D atomic superfluids

Quantum phase slips are the primary excitations in one-dimensional superfluids and superconductors at low temperature, but haven’t been so far detected in ultracold quantum gases. We have now studied experimentally the nucleation rate of phase slips in one-dimensional superfluids realized with ultracold quantum gases, owing along a periodic potential. We have observed a crossover between a regime of temperature-dependent dissipation at small velocity and interaction and a second regime of velocity-dependent dissipation at larger velocity and interaction. This behavior is consistent with the predicted crossover from thermally-assisted quantum phase slips to purely quantum phase slips.

L. Tanzi, et al.,
Velocity-dependent quantum phase slips in 1D atomic superfluids
Scientific Reports 6, 25965 (2016)

K1 people

Simona Scaffidi Abbate
PhD student
Giulia Faraoni
PhD student
Chiara D'Errico
Scientific staff
Massimo Inguscio
Scientific staff
Giovanni Modugno
Scientific staff
Former members:
Estefania De Mirandes
Benjamin Deissler
Marco Fattori
Lorenzo Gori
Avinash Kumar
Francesca Ferlaino
Eleonora Lucioni
Herwig Ott
Francesco Riboli
Giacomo Roati
Luca Tanzi
Matteo Zaccanti

K1 contacts

For further information, request of material, job opportunities, please contact:

Chiara D'Errico
(derrico@lens.unifi.it)

Giovanni Modugno
(modugno@lens.unifi.it)

K1 funding

FIRB Futuro in Ricerca
RBFR12NLNA
EU H2020 QUIC
ERC AdG DISQUA