title: Observation of a disordered bosonic insulator from weak to strong interactions.
abstract: 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 superfluidlike 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.
authors.affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy and Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy.
authors.forename: Chiara
authors.initials: C
authors.lastname: D'Errico
authors.affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy and Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Lucioni
authors.affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Tanzi
authors.affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Gori
authors.affiliation: LPTMS, Univ. Paris-Sud, CNRS, F-91405 Orsay, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Roux
authors.affiliation: Centre for Engineered Quantum Systems, University of Queensland, Brisbane 4072, Australia.
authors.forename: Ian P
authors.initials: IP
authors.lastname: McCulloch
authors.affiliation: DPMC-MaNEP, University of Geneva, 1211 Geneva, Switzerland.
authors.forename: Thierry
authors.initials: T
authors.lastname: Giamarchi
authors.affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy and INRIM, 10135 Torino, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Inguscio
authors.affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy and Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Modugno