1 research outputs found
Dynamical Vortices in Superfluid Films
The coupling of vortices to phonons in a superfluid is a gauge coupling
dictated by topology. The density and current response to a moving vortex are
computed and contrasted with the standard backflow picture. Exploiting the
analogy to (2+1)-dimensional electrodynamics, we compute the effective vortex
mass and find it to be logarithmically divergent in the low
frequency limit, leading to a super-Ohmic dissipation in response to an
oscillating superflow. Numerical integration of the nonlinear Schroedinger
equation supports these conclusions. Interaction of vortices and impurities is
also discussed.Comment: 13 pages, 6 figure