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

Luca Tanzi; Eleonora Lucioni; Saptarishi Chaudhuri; Lorenzo Gori; Avinash Kumar; Chiara D'Errico; Massimo Inguscio; Giovanni Modugno

doi:10.1103/physrevlett.111.115301

arXiv · 1307.4060

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

Luca Tanzi·Eleonora Lucioni·Saptarishi Chaudhuri·Lorenzo Gori·Avinash Kumar·Chiara D'Errico·Massimo Inguscio·Giovanni Modugno

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Abstract

We investigate the momentum-dependent transport of 1D quasi-condensates 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 non-disordered lattices the observations indicate 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.

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Luca Tanzi, Eleonora Lucioni, Saptarishi Chaudhuri, Lorenzo Gori, Avinash Kumar, Chiara D'Errico, Massimo Inguscio, Giovanni Modugno. 2013-07-15. Transport of a Bose gas in 1D disordered lattices at the fluid-insulator transition. https://doi.org/10.1103/physrevlett.111.115301

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