Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
By M. Molas, C. Faugeras, A. Slobodeniuk, K. Nogajewski, M. Bartoš, D. Basko, M. Potemski. 2016
250 citations recorded by the source corpus.
We present low-temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field B applied to monolayers of different semiconducting transition metal dichalcogenides. For WSe2 and WS2 monolayers, the dark exciton emission is observed at ∼50 meV below the bright exciton peak and displays a characteristic doublet structure whose intensity grows with B2, while no magnetic field induced emission peaks appear for MoSe2 monolayer. Our experiments also show that the MoS2 monolayer has a dark exciton ground state with a dark-bright exciton splitting energy of ∼100 meV.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1a54d7120abd6f821378a849de067ba844cd5908
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Citations in the corpus
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, background): “More recently, the role of dark exciton states has become a major field of research [25-27], as well as the emission of quantum light from localized states [28-32].”
- Dark excitons in transition metal dichalcogenides (2017, background): “While the spin-orbit splitting in the valence band is as large as few hundreds of meV [13–15], the splitting of the conduction band is predicted to be much smaller in the range of few tens of meV [7, 8, 16, 17].”
- Optical properties of atomically thin transition metal dichalcogenides: observations and puzzles (2016, methodology): “Thus, 1L MoS2 should be rather a darkish monolayer that is in accordance with our recent magneto-optical experiments [40] , but in contrast to theoretical predictions of small but still positive Δso,cb ~3 meV in this material.”