Observation of a disordered bosonic insulator from weak to strong interactions

Year: 2014

Authors: D’Errico C., Lucioni E., Tanzi L., Gori L., Roux G., McCulloch I.P.,Giamarchi T., Inguscio M., Modugno G.

Autors Affiliation: LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy; Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy; LPTMS, Univ. Paris-Sud, CNRS, F-91405 Orsay, France; Centre for Engineered Quantum Systems, University of Queensland, Brisbane 4072, Australia; DPMC-MaNEP, University of Geneva, 1211 Geneva, Switzerland 6INRIM, 10135 Torino, Ital

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 113 (9)      Pages from: 095301  to: 095301

More Information: This work was supported in part by the ERC (Grants No. 203479 and No. 247371), by the Italian MIUR (Grants No. PRIN2009FBKLN and No. RBFR12NLNA) and by the Swiss NSF under MaNEP and Division II. G. R. was supported by Grant No. ANR-2011-BS04-012-01 QuDec. I. M. was supported by the ARC Centre of Excellence for Engineered Quantum Systems (Grant No. CE110001013). The experimentalists in Florence acknowledge discussions with S. Chaudhuri, L. Fallani, C. Fort, and M. Modugno, and contributions by A. Kumar. T. G. is grateful to the Harvard Physics Department and the MIT-Harvard Center for Ultracold Atoms for support and hospitality. C. D. and E. L. contributed equally to this work.
KeyWords: Atomic physics; Physics, Bose glass; Excitation spectrum; Measurements of Mott insulators; Strong interaction; Ultracold atoms, Bosons
DOI: 10.1103/PhysRevLett.113.095301

Citations: 94
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