Transport of a bose gas in 1D disordered lattices at the fluid-insulator transition

Year: 2013

Authors: Tanzi L., Lucioni E., Chaudhuri S., Gori L., Kumar A., D’Errico C., Inguscio M., Modugno G.

Autors Affiliation: LENS and Dipartimento di Fisica e Astronomia, Universita` di Firenze, and CNR-INO 50019 Sesto Fiorentino, Italy

Abstract: We investigate the momentum-dependent transport of 1D quasicondensates in quasiperiodic optical lattices. We observe a sharp crossover from a weakly dissipative regime to a strongly unstable one at a disorder-dependent critical momentum. In the limit of nondisordered lattices the observations suggest a contribution of quantum phase slips to the dissipation. We identify a set of critical disorder and interaction strengths for which such critical momentum vanishes, separating a fluid regime from an insulating one. We relate our observation to the predicted zero-temperature superfluid-Bose glass transition.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 111 (11)      Pages from: 115301  to: 115301

More Information: We acknowledge discussions with B. Altshuler, I. Danshita, L. Pezze, G. Shlyapnikov, and A. Smerzi. This work was supported by ERC (Grants No. 203479 and No. 247371) and by MIUR (Grants No. PRIN2009FBKLN and No. RBFR12NLNA).
KeyWords: Disordered lattices; Interaction strength; Momentum-dependent; Quantum phase; Quasi-periodic; Quasicondensates; Weakly dissipative; Zero temperatures, Crystal lattices; Glass transition, Transport properties
DOI: 10.1103/PhysRevLett.111.115301

Citations: 48
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