Temperature dependent Zeeman study of bound exciton and bound multiexciton complex photoluminescence in Si(P) and Si(Li)

Abstract

The Zeeman spectra of the α1 to α4 photoluminescence lines of Si(P) and the Li1 to Li4 photoluminescence lines of Si(Li) have been measured as a function of temperature in the range 1.5–4.2 K. As expected on the basis of the Kirczenow BMEC shell model (SM), the thermalization behaviour indicated by the Si(P) spectra differs substantially from that indicated by the Si(Li) spectra. This is related to the different valley–orbit state ordering of the two systems. The observed Zeeman substructure and thermalization behaviour in both the Si(P) and Si(Li) systems is shown to be in very good agreement with the predictions of the SM. Specifically the SM predicts two unique effects: no low temperature thermalization for the Zeeman sub-components of α4 and the disappearance of all the Zeeman sub-components of Li1 at the lowest temperatures; these effects have both been observed.