Francesco Nesi and Michele Modugno 2004 J. Phys. B: At. Mol. Opt. Phys. 37 S101 doi:10.1088/0953-4075/37/7/057
Loss and revival of phase coherence in a Bose–Einstein condensate moving through an optical lattice
Francesco Nesi1,3 and Michele Modugno1,2
Show affiliationsWe investigate the phase coherence of a trapped Bose–Einstein condensate that undergoes a dynamical superfluid–insulator transition in the presence of a one-dimensional optical lattice. We study the evolution of the condensate after a sudden displacement of the harmonic trapping potential by solving the Gross–Pitaevskii equation, and comparing the results with the prediction of two effective 1D models. We show that, owing to the 3D nature of the system, the breakdown of the superfluid current above a critical displacement is not associated with a sharp transition, but there exists a range of displacements for which the condensate can recover a certain degree of coherence. We also discuss the implications on the interference pattern after the ballistic expansion as measured in recent experiments at LENS.
- PACS
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37.10.Vz Mechanical effects of light on atoms, molecules, and ions
03.75.Kk Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
03.75.Gg Entanglement and decoherence in Bose-Einstein condensates
- Subjects
- Dates
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Issue 7 (14 April 2004)
Received 28 October 2003, in final form 8 December 2003
Published 24 March 2004
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Loss and revival of phase coherence in a Bose–Einstein condensate moving through an optical lattice
Francesco Nesi and Michele Modugno 2004 J. Phys. B: At. Mol. Opt. Phys. 37 S101
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