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Lookup NU author(s): Professor Nikolaos Proukakis
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We present a consistent second order perturbation theory for the lowest-lying condensed modes of very small, weakly-interacting Bose-Einstein condensates in terms of bare particle eigenstates in a harmonic trap. After presenting our general approach, we focus on explicit expressions for a simple three-level system, mainly in order to discuss the analogy of a single condensate occupying two modes of a trap with the semi-classical theory for two-mode photon lasers. A subsequent renormalization of the single-particle energies to include the dressing imposed by mean fields demonstrates clearly the consistency of our treatment with other kinetic approaches.
Author(s): Proukakis NP, Lambropoulos P
Publication type: Article
Publication status: Published
Journal: European Physical Journal D: Atomic, Molecular, Optical and Plasma Physi
ISSN (print): 1434-6060
ISSN (electronic): 1434-6079
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