A nonlinear quantum piston for the controlled generation of vortex rings

Departamento de Matema´ticas, Escuela T´ecnica Superior de Ingenieros Industriales,and Instituto de Matema´tica Aplicada a la Ciencia y la Ingenier´ia (IMACI),Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.(Dated: July 7, 2010)We propose a simple way to manage interactions in Bose-Einstein condensates to generate vortexrings in a highly controllable way. The vortex rings are generated under the action of a quantumanalogue of a classical piston pushing the condensed atoms through a small aperture.