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Observation of a disordered bosonic insulator from weak to strong interactions
Chiara D'Errico1, Eleonora Lucioni1, Luca Tanzi2
1LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy and Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy.
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.
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