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Exciton dynamics in atomically thin semiconductors: optical lineshape, intervalley coupling, and luminescence dynamics
Author(s): Dominik Christiansen; Florian Katsch; Andreas Knorr; Malte Selig
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Paper 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.

Paper Details

Date Published: 27 February 2019
PDF: 9 pages
Proc. SPIE 10916, Ultrafast Phenomena and Nanophotonics XXIII, 109160B (27 February 2019); doi: 10.1117/12.2503640
Show Author Affiliations
Dominik Christiansen, Technische Univ. Berlin (Germany)
Florian Katsch, Technische Univ. Berlin (Germany)
Andreas Knorr, Technische Univ. Berlin (Germany)
Malte Selig, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 10916:
Ultrafast Phenomena and Nanophotonics XXIII
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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