Dark and bright exciton formation, thermalization, and photoluminescence in monolayer transition metal dichalcogenides
By M. Selig, G. Berghauser, Marten Richter, R. Bratschitsch, A. Knorr, E. Malic. 2017
195 citations recorded by the source corpus.
The remarkably strong Coulomb interaction in atomically thin transition metal dichalcogenides (TMDs) results in an extraordinarily rich many-particle physics including the formation of tightly bound excitons. Besides optically accessible bright excitonic states, these materials also exhibit a variety of dark excitons. Since they can even lie below the bright states, they have a strong influence on the exciton dynamics, lifetimes, and photoluminescence. While very recently, the presence of dark excitonic states has been experimentally demonstrated, the origin of these states, their formation, and dynamics have not been revealed yet. Here, we present a microscopic study shedding light on time- and energy-resolved formation and thermalization of bright and dark intra- and intervalley excitons as well as their impact on the photoluminescence in different TMD materials. We demonstrate that intervalley dark excitons, so far widely overlooked in current literature, play a crucial role in tungsten-based TMDs giving rise to an enhanced photoluminescence and reduced exciton lifetimes at elevated temperatures.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/4cfc8de53e8c4a0ffbac97e615a48abcd8dce51a
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Citations in the corpus
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, background): “2a) play a significant role for understanding the optical fingerprint and the dynamics in TMDs [25-27, 48, 74, 77, 79-81].”
- Dark excitons in transition metal dichalcogenides (2017, background): “The above description of the quantum yield is a good estimate provided that the thermalization is much faster than the radiative decay [4, 36].”