Scientific Results

Interacting bosons in a disordered lattice: Dynamical characterization of the quantum phase diagram

Year: 2015

Authors: Buonsante P., Pezzè L., Smerzi A.

Autors Affiliation: QSTAR, INO-CNR and LENS, Largo Fermi 2, I-50125 Firenze, Italy

Abstract: We study the quantum dynamics of interacting bosons in a three-dimensional disordered lattice. We show that the superfluid current induced by an adiabatic acceleration of the disordered lattice undergoes a dynamical instability signaling the onset of the Bose-glass phase. The dynamical superfluid-Bose-glass phase diagram is found in very good agreement with static superfluid fraction calculation. A different boundary is obtained when the disorder is suddenly quenched in a moving periodic lattice. In this case we do not observe a dynamical instability but rather a depletion of the superfluid density. Our analysis is based on a dynamical Gutzwiller approach which we show to reproduce the quantum Monte Carlo static phase diagram in the strong interaction limit.

Journal/Review: PHYSICAL REVIEW A

Volume: 91 (3)      Pages from: 031601  to: 031601

More Information: We thank L. Sanchez-Palencia, P. Lugan, and G. Modugno for discussions. L. P. acknowledges financial support by MIUR through FIRB Project No. RBFR08H058. This work has been partially supported by the Seventh Framework Programme for Research of the European Commission, under FET-Open grant QIBEC (No. 284584). Rapid Communication Editor\’s Choice.
KeyWords: ultracold atoms; disordered potential; quantum phase transition; Anderson localization; insulator transition
DOI: 10.1103/PhysRevA.91.031601

Citations: 5
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