Photoconductivity Studies of Two-Photon Magnetoabsorption in InSb and PbTe

Abstract

The photoconductivity of InSb and PbTe subjected to high-intensity C${\mathrm{O}}_2$ laser radiation (10.6 and 9.6 μm) has been examined as a function of magnetic field. Sharp maxima have now been observed for laser polarizations both perpendicular and parallel to the magnetic field. These maxima are interpreted as two-photon interband magneto-optical resonances, using a recent extension of the Keldysh ionization theory, rather than the conventional perturbation theory (which predicts maxima only for the perpendicular polarization).