ZEEMAN PATTERN OF SEMIMAGNETIC (CDMN)TE (CDMG)TE QUANTUM-WELLS IN INPLANE MAGNETIC-FIELDS/

The study of Cd0.9Mn0.1Te/Cd0.6Mg0.4Te quantum wells with semimagnetic well layers in inplane and perpendicular magnetic fields enables us t o develop a general picture of the anisotropic Zeeman splitting in sem imagnetic quantum wells. Due to quantum confinement and strain a two-d imensional spin quantization occurs, which gives rise to a vanishing s pin splitting of heavy-hole states and a twice larger spin splitting o f light-hole states for inplane magnetic fields. With increasing magne tic fields a reorientation of hole spins towards the magnetic field di rection occurs due to the huge exchange splitting in semimagnetic laye rs. Investigating different width (CdMn)Te/(CdMg)Te quantum wells with thicknesses ranging from 100angstrom down to 18angstrom a significant dependence of the inplane Zeeman pattern on the well thickness is fou nd. We demonstrate that the competition between initial quantization d ue to quantum confinement and the magnetic field induced exchange spli tting defines the complex Zeeman pattern in inplane magnetic fields.