Spectroscopy of Excited Acceptor States in GaP

Abstract

Luminescence excitation spectroscopy of donor-acceptor pair recombination in GaP is reported. We observe $s$ and $p$ excited states of C, Mg, and Zn acceptors, and deduce acceptor binding energies and Luttinger valence-band parameters (${\ensuremath{\gamma}}_{1}=4.04$, ${\ensuremath{\gamma}}_{2}=0.53$, and ${\ensuremath{\gamma}}_{3}=1.26$). Directly obtained information on the interaction between donors and acceptors characterizes the acceptor state and confirms observation of the $1{S}_{\frac{1}{2}}$ level.