Splitting between bright and dark excitons in transition metal dichalcogenide monolayers

J. P. Echeverry, B. Urbaszek, T. Amand, X. Marie, I. C. Gerber

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

144 Citas (Scopus)


The optical properties of transition metal dichalcogenide monolayers such as the two-dimensional semiconductors MoS2 and WSe2 are dominated by excitons, Coulomb bound electron-hole pairs. The light emission yield depends on whether the electron-hole transitions are optically allowed (bright) or forbidden (dark). By solving the Bethe-Salpeter equation on top of GW wave functions in density functional theory calculations, we determine the sign and amplitude of the splitting between bright and dark exciton states. We evaluate the influence of the spin-orbit coupling on the optical spectra and clearly demonstrate the strong impact of the intra-valley Coulomb exchange term on the dark-bright exciton fine structure splitting.

Idioma originalInglés
Número de artículo121107
PublicaciónPhysical Review B
EstadoPublicada - 16 mar 2016
Publicado de forma externa


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