Excitons and magneto-absorption in Cd1-xMnxTe at 500 T-fields

The magneto-absorption spectra in ultra-high magnetic fields have been meas ured continuously as a function of magnetic field up to 500 T using a combi nation of electromagnetic flux compression and the streak spectrometer. The absorption bands due to the exciton ground state and the inter-landau leve l transitions have been observed. No significant anomaly in the field depen dence of the peak energies of these absorption bands has been observed up t o 500 T. Two series of new absorption lines have been observed at the lower energy side of the exciton ground state in high fields over 150 and 350 T, The field dependence of these new absorption peaks is considerably smaller than that of the exciton ground states. It is likely that the new peaks or iginate from some localized states related to the d states of the Mn ions t hat become stable in such high fields. (C) 2001 Elsevier Science B.V. All r ights reserved.