THEORY OF 2-DIMENSIONAL MAGNETIC POLARONS IN AN EXTERNAL MAGNETIC-FIELD

Magnetic self-trapping of an exciton in a quantum well is investigated by a variational method in the adiabatic approach. It is shown that the exciton magnetic polaron (EMP) can be formed in a quantum well at temperatures up to the critical temperature (T(c)), which is found to depend on the characteristics of the structure. T(c) decreases with increasing external magnetic field. The EMP binding energy in the CdTe/Cd1-xMnxTe quantum well structure is calculated. Primary localization of the exciton at a monolayer fluctuation of the interface is taken into account. The conditions for EMP formation in one-, two- and three-dimensional (1D, 2D and 3D) structures are analysed on a comparative basis.