Derivation of a general expression for the momentum matrix elements within the envelope-function approximation.

摘要: A general expression for the momentum matrix elements both intrasubband and intersubband transitions in n- or p-type doped quantum wells, wires, dots is derived within envelope-function approximation, process unifying description of optical absorption heterostructures. The derivation nontrivially extended to case wave-function penetration into barrier a way that satisfies principle microscopic reversibility. contribution valence-band anisotropy shown contribute normal-incidence