SHALLOW DONOR IMPURITIES IN QUANTUM-WELL WIRES EFFECTS OF IMAGE POTENTIAL

We calculate the shallow donor impurity binding energies including ima ge potential quasi-one-dimensional GaAs/AlAs quantum well wires with r ectangular cross section using the variational approach. The results w e have obtained show that when impurity ion image potential is conside red the variations of binding energy ale remarkable, and when the imag e potentials of impurity ion and electron are considered simultaneousl y the corresponding variations of binding energy ale small. The result s also show that the image potential is important, especially when the cross section dimensions of quantum wires become small.