Influence of magnetic field offsets on the resistance of magnetic barriers in two-dimensional electron gases: Experiment and simulations

Strongly localized, magnetic field structures oriented perpendicular to two-dimensional electron gases, also known as magnetic barriers, are shifted in $B$ space by homogeneous, perpendicular magnetic fields. The magnetoresistance across the barrier shows a characteristic asymmetric dip in the regime where the polarity of the homogeneous magnetic field is opposite to that of the magnetic barrier. The measurements are in quantitative agreement with semiclassical simulations, which reveal that the magnetoresistance originates from the interplay of snake orbits with $E\ifmmode\times\else\texttimes\fi{}B$ drift at the edges of the Hall bar and with elastic scattering.