Abstract
We report on transport measurements in `broken gap' superlattices. A three terminal device is used to inject a tunable electron beam via a tunneling barrier into a multiple superlattice and to collect the transmitted current as a function of the injector energy. Significant increase of the derivative of the collector current is observed due to miniband conduction in the superlattice. The transconductance can be used to probe miniband positions, miniband width, and interminiband transition probabilities as a function of miniband gaps and electrical field.
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