Unambiguous observation of the2sstate of the light- and heavy-hole excitons in GaAs-(AlGa) As multiple-quantum-well structures

Abstract

Discrete peaks are seen in the photoluminescence excitation spectra of GaAs-(AlGa)As multiple-quantum-well samples which we identify as the excited $2s$ state of the $n=1\mathrm{}$ heavy- and light-hole excitons. The $1s-2s$ splitting of the excitons is accurately determined and combined with calculations of the $2s$ heavy-hole exciton binding energy to give an accurate determination of the binding energy of the ground state.