MAGNETIC CIRCULAR DICHROIC SPECTRA OF CUCL THIN-FILMS

Magnetic circular dichroic (MCD) spectra of 80-Angstrom to 1700-Angstr om thick CuCl films were measured around the Z(3) exciton region up to 6 tesla (T) at 10 K. The MCD spectra with quantized states of the tra nslational motion of the Z(3) exciton are well explained by Zeeman spl itting. The g values of these quantized states are deduced from the be st fitting between the MCD spectra and the derivative of transmission spectra. CuCl films from 80 to 290 Angstrom thick showed no change in the g value with respect to the film thickness and the quantum number n. The g values of 700- and 1700-Angstrom thick CuCl films. which were expected to exhibit bulk characteristics, were found to be identical to those of thinner films. These results indicate that the quantum siz e effect does not contribute to the relative motion of electrons and h oles in excitons for a confinement size exceeding 80 Angstrom.