 Lecture Notes for Solid State Physics by Steven H. Simon

Oxford undergraduate lecture notes. The source is distinct from the later quantum-matter notes by the same author. Section 16.2, printed pp. 178–179, describes semiconductor electron and hole transport. The displayed mobility ratio in this draft has a reversed speed-to-field typo; use the stated Drude equations and $\mu =|v_d|/|E|=|e\tau /m^{\ast }|$.