Band Structure of Layer Crystals NbSe2 and MoS2 and an Interpretation of Their Optical Spectra
Authors:
- 1 June 1974
- journal article
- research article
- Published by Wiley in Physica Status Solidi (b)
- Vol. 63 (2) , 679-690
Abstract
The optical functions a and ε2ω2 of NbSe2 and MoS2 are deduced from reflectivity measurements between 2 and 70 eV. Basing on the results of photoemission studies and band structure calculations, an experimental model is proposed of the density of states for both the valence and conduction bands. As expected, the optical behaviours of NbSe2 and MoS2 are very similar. The shape of the ε;2ω2 curve in the high energy range (30 to 50 eV) corresponding to deep level excitations describes the density of states of the conduction band in spite of some broadening of the structure. This broadening is not of experimental origin.Keywords
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