Abstract
When a magnetic field is applied to a bulk semiconductor the lowest energy excitons retain Lorentzian lineshapes.1 The magnetic confinement strongly modifies almost all the processes that govern the many-body nonlinearities of Lorentzian excitons (LX). Screening and carrier scattering depend strongly on whether carriers are in Landau levels or in bands. The LX internal structure experiences a contraction perpendicular to , and , along affecting the relative motion wave function, ψ(r), and the oscillator strength ∝|ψ (0)|2. The nonlinear optical response of semiconductors results from a delicate balance between Pauli Blocking (PB), Coulomb correlation (CC), and dephasing,2 whose relative strengths are normally fixed by the material parameters. Application of a magnetic field, which strongly affects this balance, thus provides a perfect laboratory for studying the fundamental process that govern semiconductor nonlinearities.
© 1996 Optical Society of America
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