Observation of P1/2 resonant states and Fano resonances of the deep gold acceptor in silicon.

Abstract

Optical transitions from the ground to excited states of the midgap gold acceptor in silicon have been studied by photoconductivity. Our data verify the close similarity between the line spectra of gold and those of group-III acceptors through the observation of ${P}_{1/2}$ excited states. It is also shown that Fano resonances of ${P}_{3/2}$ states involve only the \ensuremath{\Gamma} phonon (519 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) as in the case of group-III acceptors.