Abstract
A bonded rhomb sample geometry is used to study the spin-dependent absorption characteristics of an intersubband transition in the conduction band of a GaAs/AlGaAs quantum well. Optical saturation experiments, using linearly and circularly polarized beams, were compared to measure the population relaxation time of the upper subband and the degree to which spin polarization is occurring in the electron population. In sharp contrast to previous interband absorption studies, the intersubband data are consistent with a picture in which the angular momentum of the incident photons appears to bypass the electron system completely and instead exerts a direct torque on the crystal lattice.
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