Motion of Electrons and Holes in Perturbed Periodic Fields

摘要: A new method of developing an "effective-mass" equation for electrons moving in a perturbed periodic structure is discussed. This particularly adapted to such problems as arise connection with impurity states and cyclotron resonance semiconductors Si Ge. The resulting theory generalizes the usual effective-mass treatment case where band minimum not at center Brillouin zone, also degenerate. latter striking, Wannier being replaced by set coupled differential equations.