Observation of a disordered bosonic insulator from weak to strong   interactions
  We employ ultracold atoms with controllable disorder and interaction to study the paradigmatic problem of disordered bosons in the full disorder-interaction plane. Combining measurements of coherence, transport and excitation spectra, we get evidence of an insulating regime extending from weak to strong interaction and surrounding a superfluid-like regime, in general agreement with the theory. For strong interaction, we reveal the presence of a strongly-correlated Bose glass coexisting with a Mott insulator. 
Chiara D'Errico, Eleonora Lucioni, Luca Tanzi, Lorenzo Gori, Guillaume   Roux, Ian P. McCulloch, Thierry Giamarchi, Massimo ...
cond-mat.dis-nn cond-mat.quant-gas