MAGNETOOPTICAL INTERSUBBAND ABSORPTION IN GAAS ALXGA1-XAS QUANTUM-WELLS WITH INPLANE STATIC MAGNETIC-FIELDS - LOCAL-FIELD CORRECTION/

Magneto-optical intersubband absorption of a GaAs/AlxGa1-xAs quantum-w ell structure subjected to a static in-plane magnetic field is calcula ted on the basis of a nonlocal local-field formalism. Starting with a self-consistent integral equation for the local field and taking into account the electron-wave-number dependence of the wave functions, one derives the optical absorption coefficient of the quantum well. With the study being limited to the case in which the p-polarized external electromagnetic wave propagates in the direction perpendicular to the applied magnetic field, it is shown that the absorption peak that is d ue to the intersubband transition within the conduction band is upward shifted with an increase in the magnetic field. This result is attrib uted to the energy separation between the diamagnetic-shifted subbands . Local-field calculations also show that the absorption line is broad ened and that the peak absorption coefficient is reduced with the appl ied magnetic field. These effects are partly due to the nonparallel su bband energy dispersions of the quantum-well structure. (C) 1996 Optic al Society of America.