Magneto-optical intersubband absorption of a GaAs/AlxGa1-xAs quantum-well structure subjected to a static in-plane magnetic field is calculated 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 due to the intersubband transition within the conduction band is upward shifted with an increase in the magnetic field. This result is attributed to the energy separation between the diamagnetic-shifted subbands. Local-field calculations also show that the absorption line is broadened and that the peak absorption coefficient is reduced with the applied magnetic field. These effects are partly due to the nonparallel subband energy dispersions of the quantum-well structure.
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