A Numerical Study Of Magneto Transport In 2D Electronic Systems In The Presence Of Non-Uniform Magnetic Fields

摘要

We present a first approach to magneto transport of a Hall bar in non-uniform magnetic fields, which is based on a novel non-equilibrium network model. Such non-uniform fields generate magnetic barriers for current flow, which can be observed by a change of the longitudinal resistance R_(xx) that becomes a function of orientation and field amplitude of the superimposed magnetic field. For the case of a hybrid electric and magnetic confinement we find a significant suppression of equilibration between edge and bulk, resulting in a suppression of the longitudinal resistance.