Abstract
We report time-resolved photocurrent measurements of electron time of flight in GaAs/AlAs superlattices. The electron velocity is determined as a function of electric field at 77 and 300 K in a series of superlattices having miniband widths between 22 and 114 meV. Negative differential velocity is evidenced at intermediate electric fields on a picosecond time scale. A Boltzmann-Bloch transport mechanism of the Esaki-Tsu-type is shown to account for the velocity laws when carrier heating is assumed to take place.
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