LEVEL-ANTICROSSING EFFECT ON THE MAGNETOLUMINESCENCE OF THE TRIPLET INDIRECT BOUND EXCITON IN GASE

The presence of level-anticrossing in the triplet state of the indirect impurity-bound exciton in GaSe has been found for the first time in the magnetic field of 1.5 kOe applied along the c-axis. Measurements on the magnetic circular dichroism (MCD) of the photoluminescence and on the spin dependent formation rate (SDFR) show that the |Sz| = 1 level lies 0.016 meV higher than the Sz = 0 level in the absence of the magnetic field. The resonance-like behavior in these two types of polarization correlation measurements may be explained in terms of weak perturbation between |Sz| = 1 and Sz = 0 levels. © 1979.