Pressure effect on magneto-optical properties in CdTe/(Cd, Mn)Te single quantum wells with high Mn concentration

Abstract

The pressure effect on the magnetic field induced type I–type II transition is studied in a CdTe/Cd1−xMnxTe (x=0.24) single quantum well. Photoluminescence measurements under hydrostatic pressures up to 1.07 GPa and long pulsed magnetic fields up to 60 T with a pulse duration of 2 s are reported. The pressures were generated in a plastic diamond anvil cell. A bend toward lower energies (additional red shift) is observed above 28.5 T in magnetic field dependence of the exciton energy for a 13 Å thick quantum well. We attribute this red shift to a phenomenon preceding the type I–type II transition after a comparison with a simple quantum mechanical calculation. The onset field of the additional red shift increases by 3.4 T by applying a pressure of 1.07 GPa. Spin–spin coupling between the exciton and the Mn ion in the interface region is also investigated and found to be enhanced by pressure.