Application of potential harmonic expansion method to BEC: Thermodynamic properties of trapped23Na atoms |
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Authors: | Anasuya Kundu Barnali Chakrabarti Tapan Kumar Das |
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Institution: | (1) Department of Physics, University of Calcutta, 92 A.P.C. Road, 700 009 Kolkata, India;(2) Department of Physics, K.N. College, 742 101 Berhampore, India |
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Abstract: | We adopt the potential harmonics expansion method for anab initio solution of the many-body system in a Bose condensate containing interacting bosons. Unlike commonly adopted mean-field theories,
our method is capable of handling two-body correlation properly. We disregard three- and higher-body correlations. This simplification
is ideally suited to dilute Bose Einstein condensates, whose number density is required to be so small that the interparticle
separation is much larger than the range of two-body interaction to avoid three- and higher-body collisions, leading to the
formation of molecules and consequent instability of the condensate. In our method we can incorporate realistic finite range
interactions. We calculate energies of low-lying states of a condensate containing23Na atoms and some thermodynamical properties of the condensate. |
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Keywords: | Bose Einstein condensation potential harmonics two-body correlations in BEC |
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