Exchange interaction in the ground state of an exciton bound to a neutral donor

Abstract

In the exciton-neutral-donor complex the electron-hole exchange interaction mixes states of opposite symmetries with respect to the electron interchange. The present variational perturbation procedure has the advantage of scaling the results by a perturbation parameter proportional to the interband exchange integral. The calculated oscillator strength for the bound exciton recombination is in reasonably good agreement with the measured radiative lifetime of exciton bound to a neutral donor in cadmium sulphide.