Condensate statistics in interacting and ideal dilute bose gases
Phys Rev Lett
; 84(11): 2306-9, 2000 Mar 13.
Article
en En
| MEDLINE
| ID: mdl-11018871
ABSTRACT
We obtain analytical formulas for the statistics, in particular, for the characteristic function and all cumulants, of the Bose-Einstein condensate in dilute weakly interacting and ideal equilibrium gases in the canonical ensemble via the particle-number-conserving operator formalism of Girardeau and Arnowitt. We prove that the ground-state occupation statistics is not Gaussian even in the thermodynamic limit. We calculate the effect of Bogoliubov coupling on suppression of ground-state occupation fluctuations and show that they are governed by a pair-correlation, squeezing mechanism.