Local-field calculation of the optical paramagnetic response inside a two-level quantum well

A local-field formalism recently developed to describe the optical response of mesoscopic media is used to calculate the linear optical paramagnetic response of a two-level quantum well. Analytical results are presented for the s - and p -polarized components of the local field inside the quantum well. The exact results are compared to those obtained on the basis of the self-field, the first Born, and the so-called self-field first Born approximations. To illustrate our main findings, detailed numerical results are presented for the semiconducting AlGaAs/GaAs/AlGaAs quantum-well system.