Enhancing quantum coherence with short-range correlated disorder

Abstract

We introduce a two-dimensional short-range correlated disorder that is the natural generalization of the well-known one-dimensional dual random dimer model [Phys. Rev. Lett 65, 88 (1990)]. We demonstrate that, as in one dimension, this model induces a localization-delocalization transition in the single-particle spectrum. Moreover we show that the effect of such a disorder on a weakly-interacting boson gas is to enhance the condensate spatial homogeneity and delocalisation, and to increase the condensate fraction around an effective resonance of the two-dimensional dual dimers. This study proves that short-range correlations of a disordered potential can enhance the quantum coherence of a weakly-interacting many-body system.

9 pages, 12 figures

References in corpus (4)

• One-dimensional Anderson localization in certain correlated random potentials
• Enhancement of localization in one-dimensional random potentials with long-range correlations
• Gutzwiller approach to the Bose-Hubbard model with random local impurities
• Random dimer model in pseudo two-dimensional lattices

Cited by in corpus (4)

• Anderson localization in optical lattices with correlated disorder
• Ergodic-localized junctions in periodically-driven systems
• Localisation and transport in bidimensional random models with separable Hamiltonians
• Density wave propagation in a two-dimensional random dimer potential: from a single to a bipartite square lattice