Atomic, Molecular, and Optical Physics Seminar
Magnetic Manipulation of Matter Waves: Vortices, Sinkholes, and Rings
School of Physics
Georgia Institute of Technology
Ultracold gases present new opportunities to control and influence matter waves by clever manipulation of the trapping potential. For example, one can create beautifully ordered vortex lattices in a Bose-Einstein condensate by magnetic or optical "stirring" of the superfluid. In our laboratory at Georgia Tech we have used Bragg scattering to study these lattices, and have focused on the spatial profile of the diffracted atoms, which offers a new window into condensate physics. Our experiments show promise for the observation of more complex topological states, including non-rotating lattices and the von Karman vortex street. In addition to the mechanical forces, magnetic fields can also profoundly affect the wavefunction "simply" by coupling to the spin. We present a novel experimental realization of this coupling (and its rather dramatic consequences) using an "optically plugged" quadruple trap (OPT) for sodium BECs.
Raman's Group Web Page: www.physics.gatech.edu/chandra
Wednesday, November 16, 2005
Gant Science Complex