Abstract
We measured the current-dependent asymmetry of spin-split Shubnikov-de Haas (SdH) peaks at a variety of GaAs/GaAlAs heterojunctions with various sample geometries. The different current dependence of the spin-split SdH peaks is due to a spin-dependent equilibration between edge and bulk states described by an equilibration length lambda . The onset of the equilibration above a certain current limit marks the transition from non-local to partially local transport. The lambda values and the onset currents of the spin levels were investigated for different channel widths and temperatures. Measurements in tilted magnetic fields gave evidence for the dependence of the asymmetry of the spin-split SdH peaks on the relation between Landau and Zeeman splitting.
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