Splitting between bright and dark excitons in transition metal dichalcogenide monolayers
By I. Gerber, J. Echeverry, Bernhard Urbaszek, T. Amand, C. Robert, Xavier Marie. 2016
222 citations recorded by the source corpus.
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 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.
Subfields: Materials Chemistry, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/8add898936db969ff44a2b39d6844c0a09abe155
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In Materials Chemistry
- Takashi Taniguchi
- Kenji Watanabe
- T. Amand
- Xavier Marie
- Bernhard Urbaszek
- Gang Wang
- S. Tongay
- E. Malic
Citations in the corpus
- Excitonic linewidth approaching the homogeneous limit in MoS2-based van der Waals heterostructures (2017, background): “predicted that the lowest excitonic transition in MoS2 MLs should be bright [63,64], but this is still debated since the opposite configuration has also been predicted [65].”
- Dark excitons in transition metal dichalcogenides (2017, background): “Note that the momentum-forbidden spin-like K-K’ excitons are energetically degenerate with the spin-forbidden K-K excitons, however they may become separated by a few meV through the Coulomb exchange coupling that only renormalizes spin-like states [7, 17, 31].”