Exciton spectra and anisotropic Zeeman effect inPbI2at high magnetic fields up to 40 T

Magnetoabsorption spectra of the band-edge excitons in ${\mathrm{PbI}}_2$ thin single crystals were measured up to 40 T with a configuration of E⊥c?B or E⊥c⊥B. The anisotropic magnetic field dependence of the diamagnetic shift and the Zeeman effect were observed at high magnetic fields. With the configuration of E⊥c?B, a linear Zeeman splitting of the ${\mathrm{\Gamma }}_3^{\mathrm{-}}$ absorption line was observed. For the configuration of E⊥c⊥B, magnetic-field-induced absorption lines associated with the ${\mathrm{\Gamma }}_1^{\mathrm{-}}$ and the ${\mathrm{\Gamma }}_2^{\mathrm{-}}$ states were observed for π and σ polarizations, respectively. The anisotropic magnetic field dependence is discussed in terms of a cationic exciton model.