Formation of the Bound Magnetic Polaron in (Cd,Mn)Se

Strong evidence for the formation of a bound magnetic polaron in $n$-${\mathrm{Cd}}_{0.90}$ ${\mathrm{Mn}}_{0.10}$Se has been obtained from time-resolved experiments by picosecond laser spectroscopy. In particular, time-varying Stokes shifts associated with a neutral donor bound exciton have been measured to follow the evolution of the polaron at $T=2\mathrm{}$ K. From analysis of data a formation time of approximately 400 psec is inferred for the conditions of the experiment.