Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2000-04-27
Physics
Condensed Matter
Soft Condensed Matter
10 pages, 2 figures
Scientific paper
We study a system of trapped bosonic particles interacting by model harmonic forces. Our model allows for detailed examination of the notion of an order parameter (a condensate wave function). By decomposing a single particle density matrix into coherent eigenmodes we study an effect of interaction on the condensate. We show that sufficiently strong interactions cause that the condensate disappears even if the whole system is in its lowest energy state. In the second part of our paper we discuss the validity of the Bogoliubov approximation by comparing its predictions with results inferred from the exactl y soluble model. In particular we examine an energy spectrum, occupation, and fluctuations of the condensate. We conclude that Bogoliubov approach gives quite accurate description of the system in the limit of weak interactions.
Gajda Mariusz
Mostowski Jan
Orlowski Arkadiusz
Zaluska-Kotur Magdalena A.
No associations
LandOfFree
Exact versus mean-field description of the Bose-Einstein condensate: a model study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Exact versus mean-field description of the Bose-Einstein condensate: a model study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exact versus mean-field description of the Bose-Einstein condensate: a model study will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-80016