A theoretical analysis of velocity fluctuations in semiconductors is presented, and results obtained from a Monte Carlo procedure are shown for Si. It has been found in particular that (i) off-diagonal contributions to the velocity autocorrelation function must be taken into account; (ii) the convective contribution is positive; and (iii) a long tail in the autocorrelation function, due to intervalley fluctuations, may be present.
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Brunetti et al. (1983) studied this question.
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