26 Novembre 2014 - Seminario INFN - Pierfrancesco Buonsante - Interacting bosons in a disordered lattice: Dynamical characterization of the quantum phase diagram
Luogo: Aula Feynmann
Relatore: Pierfrancesco Buonsante - Istituto Nazionale di Ottica e LENS, Firenze
Indizzo e-mail: raffaella.burioni@unipr.it
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.