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American Physical Society, Physical review B, 17(82)

DOI: 10.1103/physrevb.82.172201

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Suppression of Bose-Einstein condensation in one-dimensional scale-free random potentials

Journal article published in 2010 by I. N. De Oliveira ORCID, F. A. B. F. de Moura, R. A. Caetano, M. L. Lyra
This paper is available in a repository.
This paper is available in a repository.

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Abstract

A perfect Bose gas can condensate in one dimension in the presence of a random potential due to the presence of Lifshitz tails in the one-particle density of states. Here, we show that scale-free correlations in the random potential suppress the disorder induced Bose-Einstein condensation (BEC). Within a tight-binding approach, we consider free Bosons moving in a scale-free correlated random potential with spectral density decaying as 1/kα. The critical temperature for BEC is shown to vanish in chains with a binary nonstationary potential (α>1). On the other hand, a weaker suppression of BEC takes place in nonbinarized scale-free potentials. After a slightly increase in the stationary regime, the BEC transition temperature continuously decays as the spectral exponent α→∞.