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

Abstract

The barrier impurity states of two-dimensional electron–hole complexes are considered in the strong magnetic field limit. The energies of the lowest impurity states of the exciton, the 2e–h complex and the biexciton are calculated for the different projections of the total angular momentum M with arbitrary spin orientations. The stable impurity bound states of the exciton and the biexciton exist for the case of an impurity located near the barrier edge. The magnetic evaporation of such states is expected. The magnetic induced binding of the 2e–h complex by impurities in the barrier is predicted as the magnetic field increases. The energy of the exciton separation for the Se=0,M=0 barrier impurity bound state of the 2e–h complex can be 2 times larger than that of the delocalized trion.