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.

Mott transition for strongly interacting 1D bosons

The Mott insulator is a well know quantum phase appearing in periodic potentials at integer particle fillings. In ordinary matter the potential strength cannot be changed, and it is therefore impossible to study the fate of the Mott insulator for vanishing potential strength. We have now employed an ultracold quantum gas to investigate the superfluid-insulator transition of one-dimensional bosons in shallow periodic potentials. Experimentally, we have performed transport measurements and we have analyzed them with a phase slip based model to accurately determine the Mott transition. We have compared the experimental results with a theoretical analysis based on quantum Monte Carlo simulations in continuum space and Luttinger liquid approach. Experiments and theory are in excellent agreement. Our study provides a quantitative determination of the critical parameters for the Mott transition and defines the regimes of validity of widely used approximate models, namely, the Bose-Hubbard and sine-Gordon models.

G. Boéris et al.
Mott transition for strongly interacting one-dimensional bosons in a shallow periodic potential
Phys. Rev. A 93, 011601(R) (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