Abstract
We present direct evidence of ballistic electrons traversing nominally undoped GaAs/GaAlAs short period superlattices with different well widths. The measurements are carried out using a hot-electron transistor as an electron spectrometer. An energy tunable electron beam is injected via a tunneling barrier into the field free superlattice and the transmitted collector current is measured as a function of the injector energy. Significant increase of the collector current is observed due to miniband conduction in the superlattice. The transfer characteristics shows excellent agreement with the calculated positions of the minibands and minigaps. Longitudinal optical (LO) phonon replicas of the eigenstate structure are present.
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