- Tytuł:
- Soluble Model of Interacting Bosons Trapped in Harmonic Potential: Quality of Bogoliubov Approximation
- Autorzy:
-
Załuska-Kotur, M.
Gajda, M.
Mostowski, J. - Powiązania:
- https://bibliotekanauki.pl/articles/2028887.pdf
- Data publikacji:
- 2001-10
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
03.75.Fi
05.30.Fk - Opis:
- We study a system of trapped bosonic particles interacting by model harmonic forces. Our model allows for a 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 exactly soluble model. In particular we examine an energy spectrum, occupation, and fluctuations of the condensate. We conclude that Bogoliubov approach gives a quite accurate description of the system in the limit of weak interactions.
- Źródło:
-
Acta Physica Polonica A; 2001, 100, 4; 485-504
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł