Kinetics of the bound magnetic polaron and the decay rate of thermodynamic fluctuation

The kinetics of a large bound magnetic polaron (BMP) in semimagnetic semiconductors is described, taking into account the dynamics of thermodynamic fluctuations due to diluted 3d spins within the Bohr orbit of the impurity electron. The model relates the rate of change of BMP energy in the asymptotic regime of long times to the decay rate Γ of the fluctuations, which is determined by comparing the theory with experimental results for ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Se.