  We study the nonequilibrium dynamics of line liquids as realized in the
nonlinear motion of flux lines of a superconductor driven by an applied
electric current. Our analysis suggests a transition in the dynamics of the
lines from a smooth, laminar phase at small driving forces, to a rough,
turbulent phase when the drive is increased. We explore the nature of these
phases and describe interesting analogies to driven diffusion and growing
interfaces.

Condensed Matter