Abstract
Exciton absorption spectra in high-quality β-ZnP2 single crystals have been investigated at T=1.7 K for various directions of the wave vector and various polarization states of the radiation. It has been unambiguously established that the additional high-energy A series, which in some works has been called a D series and ascribed to ZnP2 crystals, of so-called “rhombic” symmetry,1,8,10,11 is an intrinsic exciton of the β-ZnP2 series. A mixed mode has been detected for the first time, and the energy of the longitudinal exciton has been determined. The selection rules for the exciton transitions have been analyzed by a group-theoretical approach, and the symmetry of the nS states of the single exciton has been established on the basis of the experimental data — Γ −2 (z).
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Fiz. Tverd. Tela (St. Petersburg) 41, 193–202 (February 1999)
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Gorban’, I.S., Krokhmal’, A.P. & Yanchuk, Z.Z. Excitons in monoclinic zinc diphosphide. Longitudinal exciton and the mixed mode. Phys. Solid State 41, 170–178 (1999). https://doi.org/10.1134/1.1130750
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DOI: https://doi.org/10.1134/1.1130750