Splitting between Bright and Dark excitons in Transition Metal Dichalcogenide Monolayers

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

doi:10.1103/PhysRevB.93.121107

paper

Splitting between Bright and Dark excitons in Transition Metal Dichalcogenide Monolayers

arXiv:1601.07351 · doi:10.1103/PhysRevB.93.121107

Abstract

The optical properties of transition metal dichalcogenide monolayers such as the two-dimensional semiconductors MoS $_{2}$ and WSe $_{2}$ 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 $G W$ 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.

6 pages, 2 figures

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