Comment on ‘‘Multiband coupling effects on electron quantum well intersubband transitions’’ [J. Appl. Phys. 77, 747 (1995)]

Abstract
A multiband kp theory was recently proposed [L. H. Peng and C. G. Fonstad, J. Appl. Phys. 77, 747 (1995)] in order to discuss the influence of band mixing on the selection rules for intersubband and interband optical transitions in quantum wells. We point out here that the analysis presented is incorrect.