Motion of an object through a quantum fluid
Department of Physics, University of Durham, Rochester Building
South Road, Durham, DH1 3LE, England, UK
Accepted: 15 September 2000
We simulate the motion of a massive object through a dilute Bose-Einstein condensate by numerical solution of the Gross-Pitaevskii equation coupled to an equation of motion for the object. Under a constant applied force, the object accelerates up to a maximum velocity where a vortex ring is formed which slows the object down. If the applied force is less than a critical value, the object becomes trapped within the vortex core. We show that the motion follows the time-independent solutions, and use these solutions to predict the conditions required for vortex detachment.
PACS: 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena / 47.37.+q – Hydrodynamic aspects of superfluidity / 67.40.Vs – Vortices and turbulence
© EDP Sciences, 2000