The velocity of electrons in p-type InSb at 77°K has been measured as a function of the field in the range from 460 to 625 V/cm, by a time-of-flight technique. It is found that this characteristic displays negative differential mobility. The results are in good agreement with a recent theory by Fawcett and Ruch.
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Neukermans et al. (1970) studied this question.
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