Bound spin-excitons in two-dimensional electron gas

A theory of the spin exciton capture by a magnetic impurity in a 2D electro n gas is developed. We consider a resonance model for the electron scatteri ng by a transition metal impurity and calculate the binding potential for s pin excitons. This potential is spin selective and is capable of binding a spin exciton with zero angular momentum. In order to trap an exciton with a nonzero angular momentum m, the potential must exceed a certain threshold value that depends on m. (C) 2001 American Institute of Physics.