Scattering of a sound wave on a vortex in Bose-Einstein condensates

P. CAPUZZI; F. FEDERICI; M. P. TOSI

Barcelona, España

Conferencia; RPMBT14 - International Conference on Recent Progress in Many-Body Theories; 2007

Universitat Politécnica de Catalunya y Universitat de Barcelona

We investigate the scattering of sound wave perturbations by vortices in trapped Bose-Einstein condensates. Using a variational approach, we show that the energy barrier between the ground state and a state containing an axis-symmetric vortex can be surpassed by scattering with density perturbations. The transfer of angular momentum from the condensate to the perturbation can be made total for suitably chosen density perturbations carrying an energy of about 10% of the ground-state energy.