Hi I have a question regarding the basic principles lecture where the Drude model is applied to semiconductors. If I follow the derivation above, shouldn’t there be a minus sign in front of the final the part between braquets in the final equation?
That would be impossible: the conductivity is always positive, otherwise it’d violate the conservation of energy. That is also a good way to check your calculation.
Compare with the derivation of Drude conductivity from lecture 3: the sign problem in your calculation appears for both electrons and holes.
Ah yes I see the problem now, thank you
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