Impurity states of two-dimensional magnetic electron-hole complexes on a spatially separated donor center

The barrier impurity states of two-dimensional electron-hole complexes are considered in the strong magnetic field limit. The energies of the lowest i mpurity states of the exciton, the 2e-h complex and the biexciton are calcu lated for the different projections of the total angular momentum M with ar bitrary spin orientations. The stable impurity bound states of the exciton and the biexciton exist for the case of an impurity located near the barrie r edge. The magnetic evaporation of such states is expected. The magnetic i nduced binding of the 2e-h complex by impurities in the barrier is predicte d as the magnetic field increases. The energy of the exciton separation for the S-e=0, M=0 barrier impurity bound state of the 2e-h complex can be 2 t imes larger than that of the delocalized trion. (C) 1999 Elsevier Science B .V. All rights reserved.