Abstract
The vertical transport properties of the CdTe/Cd 1− x Mn x Te superlattice system were measured in magnetic fields up to 9 T. This was achieved by monitoring the optical emission from a superlattice grown by MBE on an InSb substrate. The results enabled estimates to be made of the diffusion coefficient and the diffusion length as a function of magnetic field for given values of x, and demonstrated the existence of magnetic polaron formation for the trapped carrier states associated with exciton formation. Calculations of the magnetic polaron energies associated with free particles show them to be negligible, and hence unimportant for free particle transport. However, bound excitons display appreciable polaron energies which shift the emission peak energies and broaden the line-width. These effects were observed in our experiments and the corresponding polaron energies determined from a comparison of the experimental data with the theoretical expressions. From the observed ratio of the emission intensities and employing standard diffusion theory [1], the diffusion coefficient and diffusion length was determined as a function of magnetic field for given values of x.
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