Excitons in monoclinic zinc diphosphide. Longitudinal exciton and the mixed mode |
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Authors: | I S Gorban’ A P Krokhmal’ Z Z Yanchuk |
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Institution: | (1) Kiev State (T. Shevchenko) University, 252022 Kiev, Ukraine |
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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).
Fiz. Tverd. Tela (St. Petersburg) 41, 193–202 (February 1999) |
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Keywords: | |
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