Abstract
We investigate the vortex-lattice structure for single- and two-component Bose-Einstein condensates in the presence of an optical lattice, which acts as a pinning potential for the vortices. The problem is considered in the mean-field quantum Hall regime, which is reached when the rotation frequency Ω of the condensate in a radially symmetric trap approaches the (radial) trapping frequency ω and the interactions between the atoms are weak. We determine the vortex-lattice phase diagram as a function of optical-lattice strength and geometry. In the limit of strong pinning the vortices are always pinned at the maxima of the optical-lattice potential, similar to the slow-rotation case. At intermediate pinning strength, however, due to the competition between interactions and pinning energy, a structure arises for the two-component case where the vortices are pinned on lines of minimal potential.
| Original language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 013605/1-013605/6 |
| Number of pages | 6 |
| Journal | Physical review. A, Atomic, molecular and optical physics |
| Volume | 79 |
| Issue number | 1 |
| Publication status | Published - 2009 |