Inducing vortices in a Bose-Einstein condensate using holographically   produced light beams
  In this paper we demonstrate a technique that can create out-of-equilibrium vortex configurations with almost arbitrary charge and geometry in a Bose-Einstein condensate. We coherently transfer orbital angular momentum from a holographically generated light beam to a Rubidium 87 condensate using a two-photon stimulated Raman process. Using matter wave interferometry, we verify the phase pattern imprinted onto the atomic wave function for a single vortex and a vortex-antivortex pair. In addition to their phase winding, the vortices created with this technique have an associated hyperfine spin texture. 
Johannes F. S. Brachmann, Waseem S. Bakr, Jonathon Gillen, Amy Peng   and Markus Greiner
cond-mat.quant-gas physics.atom-ph quant-ph