Publication Date
2003
Journal or Book Title
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Abstract
We investigate the dynamics of vortices in repulsive Bose–Einstein condensates in the presence of an optical lattice (OL) and a parabolic magnetic trap. The dynamics is sensitive to the phase of the OL potential relative to the magnetic trap, and depends less on the OL strength. For the cosinusoidal OL potential, a local minimum is generated at the trap's centre, creating a stable equilibrium for the vortex, while in the case of the sinusoidal potential, the vortex is expelled from the centre, demonstrating spiral motion. Cases where the vortex is created far from the trap's centre are also studied, revealing slow outward-spiralling drift. Numerical results are explained in an analytical form by means of a variational approximation. Finally, motivated by a discrete model (which is tantamount to the case of the strong OL lattice), we present a novel type of vortex consisting of two pairs of antiphase solitons.
Pages
3467-3476
Volume
36
Issue
16
Recommended Citation
Kevrekidis, PG; Carretero-Gonzalez, R; Theocharis, G; Frantzeskakis, DJ; and Malomed, BA, "Vortices in a Bose-Einstein condensate confined by an optical lattice" (2003). JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS. 940.
Retrieved from https://scholarworks.umass.edu/math_faculty_pubs/940
Comments
This is the pre-published version harvested from arXiv. The published version is located at http://iopscience.iop.org/0953-4075/36/16/308/