Magneto-optical effects of the Wannier exciton in a biaxial ZnP2 crystal. I

Article abstract of DOI:10.1143/JPSJ.57.3256

An exciton absorption spectrum of a monoclinic ZnP₂ crystal for E // b polarization has been measured in magnetic fields up to 14 T. From behaviors of the exciton line series in the magnetic fields parallel to the a-, b- and c-axes, it is found that the exciton is of s-type and has a paramagnetic splitting with the g-factor of 4. Analyzing the diamagnetic shift in a biaxial crystal, we estimate exciton reduced masses and background dielectric constants in the a-, b- and c-axes to be μ_a,=(0.39±0.03)m ₀, μ_b= (0.45±0.03)m₀, μ_c=(0.15±0.01)m₀=7.8±0.2, ε_b=10.0±0.2 and ε_c= 9.7±0.2, respectively.