Quantum dynamics in splitting a harmonically trapped Bose-Einstein condensate by an optical lattice:truncated Wigner approximation

Isella, L. and Ruostekoski, J. (2006) Quantum dynamics in splitting a harmonically trapped Bose-Einstein condensate by an optical lattice:truncated Wigner approximation. Physical review a, 74 (6). ISSN 1050-2947

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Abstract

We study the splitting of a harmonically trapped atomic Bose-Einstein condensate when we continuously turn up an optical lattice, or a double-well, potential. As the lattice height is increased, quantum fluctuations of atoms are enhanced. The resulting nonequilibrium dynamics of the fragmentation process of the condensate, the loss of the phase coherence of atoms along the lattice, and the reduced atom number fluctuations in individual lattice sites are stochastically studied within the truncated Wigner approximation. We perform a detailed study of the effects of temperature and lattice height on atom dynamics, and investigate the validity of the classical Gross-Pitaevskii equation in optical lattices. We find the atom number squeezing to saturate in deep lattices due to nonadiabaticity in turning up of the lattice potential that is challenging to avoid in experiments when the occupation number of the lattice sites is large, making it difficult to produce strongly number squeezed, or the Mott insulator, states with large filling factors. We also investigate some general numerical properties of the truncated Wigner approximation.

Item Type: Journal Article
Journal or Publication Title: Physical review a
Additional Information: 6362
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 123679
Deposited By: ep_importer_pure
Deposited On: 26 Feb 2018 11:08
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 03:58
URI: https://eprints.lancs.ac.uk/id/eprint/123679

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