The intensity dependence of interband Landau absorption

Microscopic models, first developed for the interpretation of nonlinear refraction in semiconductors, are applied to nonlinear magneto-absorption. Two related models, namely the direct saturation model and the blocking model, are presented. These represent the limiting cases of slow and fast intraband scattering respectively. The predicted absorption lineshape and saturation characteristics for each model are contrasted and compared. It is shown that the inclusion of finite temperature in the blocking model can result in a shift of the absorption peak to higher magnetic fields, in direct contrast to the zero temperature Burstein-Moss shift of the band edge. The expressions obtained are compared to experimental results (ibid) to yield characteristic lifetimes in InSb. © 1982.