Vortex-lattice pinning in two-component Bose-Einstein condensates

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 $\Omega$ of the condensate in a radially symmetric trap approaches the (radial) trapping frequency $\omega$ 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.

References in corpus (5)

• Pinning of vortices in a Bose-Einstein condensate by an optical lattice
• Vortex configurations of bosons in an optical lattice
• Pinning and collective modes of a vortex lattice in a Bose-Einstein condensate
• Vortex lattices of bosons in deep rotating optical lattices
• Rotating states for trapped bosons in an optical lattice