Magneto-optical investigation of shallow donors in GaP

Abstract

The magnetic circular dichroism of the absorption (MCDA) of transitions between the ground state and the excited bound exciton states of the neutral donors S 0, Te 0 and Ge 0 in GaP was measured. Zero phonon lines and phonon replicas were resolved. The MCDA lines were correlated to the S 0, Te 0 and Ge 0 EPR spectra by measuring the tagged MCDA spectra. Furthermore, for S 0 and Te 0 donors the MCDA of a photoionisation transition into the L-band minimum was observed with an onset at 0.55 eV (S 0) and 0.53 eV (Te 0), respectively.