Two‐photon absorption and magnetoabsorption of P excitons in β‐ZnP₂

Abstract

Abstract Electronic transitions in biaxial β‐ZnP 2 are studied by two‐photon absorption. The anisotropy of the crystal leads to a large energy splitting of the P excitons. The energy shift of the P excitons and Landau transitions are observed in a magnetic field up to 6T. We present a theory which describes the anisotropic P excitons in a magnetic field. The analysis of the experimental data allows the determination of the anisotropic dielectric constants and effective masses of the valence and conduction bands.