Document Type

Article

Publication Date

Winter 12-15-2006

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

97

Issue

24

First Page

240402-1

Last Page

240402-4

DOI

10.1103/PhysRevLett.97.240402

Abstract

We report the observation of vortex pinning in rotating gaseous Bose-Einstein condensates. Vortices are pinned to columnar pinning sites created by a corotating optical lattice superimposed on the rotating Bose-Einstein condensates. We study the effects of two types of optical lattice: triangular and square. In both geometries we see an orientation locking between the vortex and the optical lattices. At sufficient intensity the square optical lattice induces a structural crossover in the vortex lattice.

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