Multimode mean-field model for the quantum phase transition of a Bose-Einstein condensate in an optical resonator |
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Authors: | G Kónya G Szirmai P Domokos |
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Institution: | 1. Research Institute for Solid State Physics and Optics, P.O Box 49, 1525, Budapest, Hungary 2. ICFO-Institut de Ciències Fotòniques, Mediterranean Techonoly Park, 08860, Castelldefels (Barcelona), Spain
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Abstract: | We develop a mean-field model describing the Hamiltonian interaction of ultracold atoms and the optical field in a cavity. The Bose-Einstein condensate is properly defined by means of a grand-canonical approach. The model is efficient because only the relevant excitation modes are taken into account. However, the model goes beyond the two-mode subspace necessary to describe the self-organization quantum phase transition observed recently. We calculate all the second-order correlations of the coupled atom field and radiation field hybrid bosonic system, including the entanglement between the two types of fields. |
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