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

  Articoli su Riviste JCR/ISI  (anno 2015)

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

Affiliazione Autori:  QSTAR, INO-CNR and LENS, Largo Fermi 2, I-50125 Firenze, Italy

Riassunto:  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.

Rivista/Giornale:  PHYSICAL REVIEW A
Volume n.:  91 (3)      Pagine da: 031601  a: 031601
Ulteriori informazioni:  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.
DOI: 10.1103/PhysRevA.91.031601

*Impact Factor della Rivista: (2015) 2.765   *Citazioni: 4
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  12/05/2019

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