Abstract
Magnetotransport measurements up to 50 T have been performed on single Si-δ-doped layers in InSb as well as on a structure consisting of 10 δ-doped layers which are situated 50 nm apart. The low resistivity 3D channel that conceals the 2D conduction at low magnetic fields for the single δ-layers is not observed in the 10 δ-layer configuration. The occurrence of a quantum Hall plateau at a filling factor v = 1 in this system implies that the 2D conduction is due to a single 2D electron gas rather than to 10 independent 2D channels.
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