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VOLUME 60 (1994) | ISSUE 10 | PAGE 731
General expression for optical transition probabilities within the envelope-function approximation
A general approach to the calculation of the momentum matrix elements within the envelope function approximation is presented. The contribution of anisotropy is shown for the first time to contribute to normal incidence absorption in p-type quantum wells. The present model also unifies the description of optical absorption in nand p-type quantum wells.