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Multiserial Structure of Excitonic Energy Spectrum in Monoclinic ZnP 2 Crystal
Author(s) -
Gorban I. S.,
Bilyi M. M.,
Dmitruk I. M.,
Yeshchenko O. A.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199805)207:1<171::aid-pssb171>3.0.co;2-1
Subject(s) - exciton , monoclinic crystal system , fine structure , crystal (programming language) , anisotropy , energy level splitting , absorption spectroscopy , condensed matter physics , spectral line , atomic physics , series (stratigraphy) , exchange interaction , physics , chemistry , molecular physics , crystal structure , quantum mechanics , crystallography , paleontology , ferromagnetism , computer science , programming language , biology
One‐photon excitonic absorption spectra of the monoclinic ZnP 2 (β‐ZnP 2 ) crystals are analysed. There exist four series characterized by the serial law E n = E g — Ry/ n 2 + Δ/n 3 with the same value of energy gap E g = 1.6026 meV. By variational calculations of the exciton energy dependence on the anisotropy parameter, we conclude an appearance of several hydrogen‐like series caused by the splitting of excitonic states with different quantum numbers l and | m | due to the low symmetry of the crystal. Conclusions are made that two series with Δ = 0 can be attributed to the P‐states of an exciton, and two others with Δ ≠ 0 to the S‐states of an exciton. Calculations of e–h exchange interaction in an S‐exciton are performed. Splitting of the series with Δ ≠ 0 is interpreted to have exchange origin (ortho–para‐splitting). Its value is obtained to be 12.7 meV.