Type

Journal Article

Authors

V. A. Zagrebnov
L. A. Pastur
T. C. Dorlas

Subjects

Physics

Topics
single site threshold continuous random enhancement hand density critical

Condensation in a Disordered Infinite-Range Hopping Bose–Hubbard Model (2006)

Abstract We study Bose-Einstein Condensation (BEC) in the Infinite-Range Hopping Bose-Hubbard model for repulsive on-site particle interaction in presence of ergodic random one-site potentials with different distributions. We show that the model is exactly soluble even if the on-site interaction is random. But in contrast to the non-random case [BD], we observe here new phenomena: instead of enhancement of BEC for perfect bosons, for constant on-site repulsion and discrete distributions of the single-site potential there is suppression of BEC at some fractional densities. We show that this suppression appears with increasing disorder. On the other hand, the BEC suppression at integer densities may disappear, if disorder increases. For a continuous distribution we prove that the BEC critical temperature decreases for small on-site repulsion while the BEC is suppressed at integer values of density for large repulsion. Again, the threshold for this repulsion gets higher, when disorder increases.
Collections Ireland -> DAIR -> Type = Article
Ireland -> DAIR -> Status = Published

Full list of authors on original publication

V. A. Zagrebnov, L. A. Pastur, T. C. Dorlas

Experts in our system

1
T. C. Dorlas
DAIR
Total Publications: 44