American Physical Society, Physical review B, 17(82)
DOI: 10.1103/physrevb.82.172201
Full text: Download
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→∞.