Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-01-18
Phys. Rev. A 83, 013629 (2011)
Physics
Condensed Matter
Quantum Gases
21 pages, 11 figures. Accepted in PRA
Scientific paper
10.1103/PhysRevA.83.013629
We study the winding number dependence of the stationary states of a Bose-Einstein condensate in a ring-shaped lattice. The system is obtained by confining atoms in a toroidal trap with equally spaced radial barriers. We calculate the energy and angular momentum as functions of the winding number and the barrier height for two quite distinct particle numbers. In both cases we observe two clearly differentiated regimes. For low barriers, metastable vortex states are obtained up to a maximum winding number which depends on the particle number and barrier height. In this regime, the angular momentum and energy show, respectively, almost linear and quadratic dependences on the winding number. For large barrier heights, on the other hand, stationary states are obtained up to a maximum winding number which depends only on the number of lattice sites, whereas energy and angular momentum are shown to be sinusoidal functions of the winding number.
Cataldo H. M.
Jezek Dora M.
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