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27 February 2019 Exciton dynamics in atomically thin semiconductors: optical lineshape, intervalley coupling, and luminescence dynamics
Dominik Christiansen, Florian Katsch, Andreas Knorr, Malte Selig
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Proceedings Volume 10916, Ultrafast Phenomena and Nanophotonics XXIII; 109160B (2019) https://doi.org/10.1117/12.2503640
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
The strong Coulomb interaction in two-dimensional transition metal dichlacogenides gives rise to tightly bound excitons, which dominate their optical properties. Because of their complex quasi-particle band structure, TMDs possess a variety of optically bright and dark excitonic states. Here, we present a theoretical framework to efficiently describe excitonic intervalley physics. Within this model, we first calculate the coherence lifetime and optical line shape under influence of phonons. Secondly, we present the time-resolved formation and thermalization of bright and dark intra- and intervalley excitons. We find that momentum-forbidden dark excitonic states play a crucial role in tungsten-based TMDs.
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Dominik Christiansen, Florian Katsch, Andreas Knorr, and Malte Selig "Exciton dynamics in atomically thin semiconductors: optical lineshape, intervalley coupling, and luminescence dynamics", Proc. SPIE 10916, Ultrafast Phenomena and Nanophotonics XXIII, 109160B (27 February 2019); https://doi.org/10.1117/12.2503640
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KEYWORDS
Dielectric polarization
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