ELECTRONIC-STRUCTURE OF SHALLOW DONOR PAI RS IN MANY-VALLEY SEMICONDUCTOR

The ground state energy of a shallow donor pair in semiconductor with anisotropic effective mass is calculated in the framework of the effec tive mass theory. The energy is found to be minimal if the axis of the pair is orthogonal to the direction corresponding to the greatest val ue of the effective mass. It is concluded that the electronic structur e of donor molecule in a many-valley semiconductor depends on the mole cule orientation with respect to the crystallgraphic directions.