Ab initio study of electronic excitations and the dielectric function in molybdenum disulfide monolayer

Despoja, Vito and Rukelj, Zoran and Maruć, Leonardo (2016) Ab initio study of electronic excitations and the dielectric function in molybdenum disulfide monolayer. Physical Review B, 94 (16). pp. 165446-10. ISSN 1098-0121

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Abstract

The propagator of the induced dynamically screened Coulomb interaction Wind(Q,ω,z,z ) is calculated for the MoS2 monolayer. The energy-loss rate of a point charge placed near the MoS2 monolayer is calculated (using the spatial resolution of the Wind in the direction perpendicular to the MoS2 plane) and successfully compared with very recent electron-energy-loss spectroscopy measurements of Hong et al. [J. Hong et al., Phys. Rev. B 93, 075440 (2016)]. The induced propagator Wind, compared with its classical analogous propagator, is used to determine the effective dielectric function eff(ω) of atomically thick crystals. It is shown that eff(ω) extracted from Wind is in good agreement with the dielectric function of the MoS2 extracted from the ellipsometry measurements. A recently proposed method for calculation of the dielectric tensor in quasi-two-dimensional crystals is used to calculate the parallel (ω) and perpendicular ⊥(ω) dielectric functions in MoS2, which are compared with some previous measurements and calculations.

Item Type: Article
Date: 26 October 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 25 August 2016; published 26 October 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Dec 2016 15:40
Last Modified: 29 Nov 2017 16:36
URI: http://digre.pmf.unizg.hr/id/eprint/5364

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