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Quantum rotor model for a Bose-Einstein condensate of dipolar molecules | | J. Armaitis
; R.A. Duine
; H.T.C. Stoof
; | | Date: |
3 Jun 2013 | | Abstract: | We show that a Bose-Einstein condensate of heteronuclear molecules in the
regime of small and static electric fields is described by a quantum rotor
model for the macroscopic electric dipole moment of the molecular gas cloud. We
solve this model exactly and compare the results of this exact calculation with
the usual Gross-Pitaevskii mean-field theory for Bose-Einstein condensation.
This comparison shows that qualitative and experimentally observable
differences exist between exact and mean-field results due to the crucial role
of quantum fluctuations. In particular, the non-zero dipole moment predicted by
mean-field theory is quenched by the latter fluctuations in a large part of the
phase diagram. Investigation of the wavefunction of the macroscopic dipole
moment reveals squeezing of the probability distribution. | | Source: | arXiv, 1306.0398 | | Services: | Forum | Review | PDF | Favorites | |
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