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

Autori
Despoja, Vito ; Rukelj, Zoran ; Marušić, Leonardo

Izvornik
Physical review. B. (2469-9950) 94 (2016), 16; 165446, 1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
molybdenum disulfide ; dielectric function ; EELS

Sažetak
The propagator of the induced dynamically screened Coulomb interaction W ind (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 W ind 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 W ind , 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 W ind 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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