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.

Exploring quantum phase slips in 1D bosonic systems

Quantum phase slips, i.e., the primary excitations in one-dimensional superfluids at low temperature, have been well characterized in most condensed-matter systems, with the notable exception of ultracold quantum gases. Here we present our experimental investigation of the dissipation in one-dimensional Bose superfluids flowing along a periodic potential, which show signatures of the presence of quantum phase slips. In particular, by controlling the velocity of the superfluid and the interaction between the bosons we are apparently able to drive a crossover from a regime of thermal phase slips into a regime of quantum phase slips. Achieving a good control of quantum phase slips in ultracold quantum gases requires to keep under control other phenomena such as the breaking of superfluidity at the critical velocity or the appearance of a Mott insulator in the strongly correlated regime. Here we show our current results in these directions.

S. Scaffidi Abbate, et al.,
Exploring quantum phase slips in 1D bosonic systems
Eur. Phys. J. Spec. Top. 226, 2815 (2017)

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