1206.2198 (C. C. Huang et al.)

Vortices in a rotating Bose-Einstein condensate under extreme elongation
in a harmonic plus quartic trap    [PDF]

C. C. Huang, C. H. Liu, W. C. Wu

The behaviors of a rapid rotating Bose-Einstein condensate under extreme elongation in a 2D anisotropic harmonic plus quartic trap are investigated. Due to the quartic trap, the system remains stable at high rotating velocity, $\Omega\geq \omega_\perp$ ($\omega_\perp$ is the radial harmonic trap frequency), and vortex lattices form even in the absence of the repulsive s-wave interaction ($g$). When $g$ is present, the interplay between $g$ and the quartic trap potential can lead to rich vortex lattice transition states as a function of $\Omega$, to which vortex lattices vanish eventually at some higher $\Omega$.

View original: http://arxiv.org/abs/1206.2198