Abstract
Magneto-transport studies in an n-i-n doped GaAs/AlAs/Ga(AsN) heterostructure are described. This system acts as a resonant-tunnelling diode in which electrons can tunnel through the N-induced states in the Ga(AsN) layer. Magneto-tunnelling spectroscopy with magnetic fields parallel and perpendicular to the current direction is used to probe the nature, band-like or impurity-like, of the N states. The data indicate that the electron wavefunction of the N states is strongly localised and extends over distances smaller than 1.8 nm.
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