Magnetic field effects on the triplet excitons in β-ZnP2

Magnetic field effects on the excitation spectra of the 1s triplet exciton luminescence in monoclinic β-ZnP2 were observed at 2 K. Under the magnetic field of 1 T, the luminescence band splits into two components with the separation of about 0.2 meV. The excitation spectrum for each of the Zeeman-split components was measured for the first time. The spectrum for the one component is definitely different to the other.