Dynamics of photoexcited carriers in molecular beam epitaxy grown semimagnetic epilayers in magnetic fields

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Abstract
Time-resolvedphotoluminescence has been measured on molecular beam epitaxygrown Cd 1−x Mn x Te epilayer samples. The photoluminescence intensity of magnetic polarons exhibits a very long emission tail. The observed phenomenon is attributed to the conversion of the dark excitons to dipole allowed transitions by a spin-flip process. The magnetic field dependence of the two-exponential decay property is discussed within the frame of giant Zeeman splitting, the spin-flip scattering, and the formation of the magnetic polarons.