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  • Letter

Mott-glass phase induced by long-range correlated disorder in a one-dimensional Bose gas

Phys. Rev. A 110, L041304 – Published 25 October, 2024

DOI: https://doi.org/10.1103/PhysRevA.110.L041304

Abstract

We determine the phase diagram of a one-dimensional Bose gas in the presence of disorder with short- and long-range correlations, the latter decaying with distance as 1/|x|1+σ. When σ<0, the Berezinskii-Kosterlitz-Thouless transition between the superfluid and the localized phase is driven by the long-range correlations and the Luttinger parameter K takes the critical value Kc(σ)=3/2−σ/2. The localized phase is a Bose glass for σ>σc=3−π2/3≃−0.289868, and a Mott glass—characterized by a vanishing compressibility and a gapless conductivity—when σ<σc. Our conclusions, based on the nonperturbative functional renormalization group and perturbative renormalization group, are confirmed by the study of the case σ=−1, corresponding to a perfectly correlated disorder in space, where the model is exactly solvable in the semiclassical limit K→0+.

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