Hole-spin reorientation in (CdTe)0.5(Cd_(0.75)Mn_(0.25)Te)_(0.5) tilted superlattices grown on Cd_(0.74)Mg_(0.26)Te(001) vicinal surface

摘要

We have studied anisotropic exchange interaction in (CdTe)0.5(Cd0.75Mn0.25Te)0.5 tilted superlattices fabricated by fractional monolayer growth onto a 1° off vicinal surface. The Zeeman shift in the Voigt configuration depends on the direction of the external magnetic field in the (001) plane. When applying the external magnetic field parallel to the wire direction, linear polarization of the magneto-PL reveals reorientation of hole spins into the external field direction. Moreover, in the parallel magnetic field the valence-band mixing occurs for fields larger than ~3.5 T, which results in anisotropic Zeeman shifts.