Zeeman Effect of Bound Excitons in Gallium Phosphide

The Zeeman effect of the recombination radiation from bound exciton complexes in GaP was investigated as function of direction of the magnetic field in the crystal. Cubic anisotropy was observed in the Zeeman pattern. This was analyzed using an effective spin Hamiltonian for the bound holes; numerical values of the constants in the spin Hamiltonian and $g$ values of the electrons were determined from the data.