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arXiv · 1510.01883

Enhancing quantum coherence with short-range correlated disorder

Pablo Capuzzi·Mario Gattobigio·Patrizia Vignolo
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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.

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Pablo Capuzzi, Mario Gattobigio, Patrizia Vignolo. 2015-10-07. Enhancing quantum coherence with short-range correlated disorder. https://doi.org/10.1103/physreva.92.053622

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