SIMPLIFIED TREATMENT OF MANY-BODY EFFECTS IN THE INTERSUBBAND ABSORPTION OF SYMMETRICAL UNIFORMLY DOPED QUANTUM-WELLS AT ZERO-TEMPERATURE

We present a simplified calculation of the intersubband absorption in symmetric, uniformly doped quantum wells at zero temperature, which ta kes into account conduction-band nonparabolicity (via an energy-depend ent effective mass) and treats all effects (including the direct Coulo mb, exchange, depolarization, and excitonlike) on an equal footing. Th ere is no need to solve self-consistent equations (i.e., Hartree or Ha rtree-Fock) in our method and we obtain our results without recourse t o advanced many-body techniques; yet we still find good agreement with experiments. We examine in particular the effect of conduction-band n onparabolicity on the peak absorption energy. Our results should there fore be of particular interest to experimentalists seeking to model th eir results.