NONLINEAR FARADAY-EFFECT IN CDS SEMICONDUCTOR IN AN ULTRAHIGH MAGNETIC-FIELD

Joint American-Russian experiments to study the optical and magnetoopt ical properties of CdS in ultrahigh magnetic fields up to similar to 7 .5 MG were carried out. A significant nonlinearity in the angle of rot ation of the polarization plane was observed in CdS at wavelengths of 544 nm at T = 100 K, H = 2.5 MG and of 633 nm at T = 300 K, H = 5 MG. An absorption spectrum study at probe wavelength of similar to 495 nm (300 K) revealed an increase in optical transmission associated with a splitting of the conduction band. A microscopic-phenomenological mode l which qualitatively and quantitatively explains all the experimental results is proposed.