Experimental demonstration of painting arbitrary and dynamic potentials for Bose-Einstein condensates

Abstract

There is a pressing need for robust and straightforward methods to create potentials for trapping Bose-Einstein condensates which are simultaneously dynamic, fully arbitrary, and sufficiently stable to not heat the ultracold gas. We show here how to accomplish these goals, using a rapidly-moving laser beam that "paints" a time-averaged optical dipole potential in which we create BECs in a variety of geometries, including toroids, ring lattices, and square lattices. Matter wave interference patterns confirm that the trapped gas is a condensate. As a simple illustration of dynamics, we show that the technique can transform a toroidal condensate into a ring lattice and back into a toroid. The technique is general and should work with any sufficiently polarizable low-energy particles.

Minor text changes and three references added. This is the final version published in New Journal of Physics

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• Generating ring currents, solitons, and svortices by stirring a Bose-Einstein condensate in a toroidal trap
• Versatile two-dimensional potentials for ultra-cold atoms
• An adaptive inelastic magnetic mirror for Bose-Einstein condensates
• Lifshitz-like transition and enhancement of correlations in a rotating bosonic ring lattice
• Dark dynamic acousto-optic ring lattices for ultracold atoms
• Superfluid toroidal currents in atomic condensates

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