CLASSICAL ADVECTION OF GUIDING CENTERS IN A RANDOM MAGNETIC YIELD

We investigate theoretically and experimentally classical advective tr ansport in a 2D electron gas in a random magnetic field. For uniform e xternal perpendicular magnetic fields large compared to the random fie ld we observe a strong enhancement of conductance compared to the ordi nary Drude value. This can be understood as resulting from advection o f cyclotron guiding centers. For low disorder this enhancement shows n on-trivial scaling as a function of scattering time, with consistency between theory and experiment.