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Optical Properties and Collective Excitations in MoS 2 and NbSe 2 in the 1.7 to 30 eV Range
Author(s) -
Martin L.,
Mamy R.,
Couget A.,
Raisin C.
Publication year - 1973
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/pssb.2220580223
Subject(s) - electron , valence electron , range (aeronautics) , valence (chemistry) , energy (signal processing) , physics , atomic physics , chemistry , condensed matter physics , materials science , quantum mechanics , composite material
Optical functions of two layer type compounds MoS 2 and NbSe 2 are calculated in the 1.7 to 30 eV range from reflectivity data by means of a Kramers‐Kronig analysis. The positions of the plasmon peaks given by the energy loss function, — Im \documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \varepsilon _ \bot ^{ - 1} $\end{document} , are in good agreement with those evaluated directly by electron energy loss experiments. The optical effective number of electrons saturates at the high energy boundary of the experimental interval, for a value corresponding to all the valence electrons.