Excitons in semimagnetic semiconductor quantum-well systems: Magnetic polaron effects

The energy of the exciton formed from an electron and heavy hole in a narrow CdTe quantum well between barriers of ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Te is evaluated using a simple variational trial function. The magnetic polaron effect, resulting from the exchange interaction of the carriers with localized Mn-ion spins located in the barrier, is included. Because of its heavier mass and small quantum-well depth, the hole is much more dramatically influenced by the magnetic polaron effect and tends to localize near one of the interfaces.