POLARIZATION-DEPENDENT DEPHASING MEASUREMENTS IN CDXZN1-XTE ZNTE MULTIPLE-QUANTUM-WELL STRUCTURES/

Polarization dependent dephasing measurements are performed in inhomog eneously broadened CdxZn1-xTe/ZnTe multiple quantum wells at low and h igh exciton densities. At low temperature and density the self-diffrac ted signal when the beams are cross-polarized is much weaker than, and decays much faster than, the signal obtained when the beams are co-po larized. At high densities the signal strengths become the same. A mod el is proposed to explain the results. We find that the dynamics of a small subset of excitons which are created in a spatially bunched mann er can be probed by cross polarizing the beams.