The transition between coherent and incoherent transport in undoped GaAs/AlGaAs superlattices is observed. Hot electron spectroscopy is used to measure the superlattice transmittance at different bias conditions. For a short-period superlattice the transmittance is found to be independent of the direction of the electric field. For a superlattice larger than the coherence length, the transmission becomes asymmetric and dependent on the electric field direction. The onset of scattering-induced miniband transport is clearly evident. A coherence length of 150 nm, limited by surface roughness, and a scattering time of 1 ps are determined.
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Rauch et al. (1998) studied this question.
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