Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: Poster: Two-Dimenaional Materials and Topological Insulators
HL 14.7: Poster
Montag, 20. März 2017, 14:00–18:00, P2-OG3
Excitonic phonon sidebands in monolayer transition metal dichalcogenides — •Dominik Christiansen1, Malte Selig1, Gunnar Berghäuser2, Robert Schmidt3, Iris Niehues3, Robert Schneider3, Ashish Arora3, Steffen Michaelis de Vasconcellos3, Rudolf Bratschitsch3, Ermin Malic2, and Andreas Knorr1 — 1Nichtlineare Optik und Quantenelektronik, Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Department of Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden — 3Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm Str. 10, 48149 Münster, Germany
Monolayer transition metal dichalcogenides (TMDs) are direct band gap semiconductors with an extraordinarily strong Coulomb interaction, leading to the formation of excitonic quasiparticles.
Here, we present a microscopic study of the influence of the exciton-phonon interaction on the absorption line shape of TMDs. A treatment of the exciton-phonon interaction beyond the Markov approximation predicts the appearance of phonon-induced sidebands that are accompanied by a pronounced polaron-red shift. In a joint theory-experiment study, we observe an asymmetry of the absorption line shape due to the interplay of phonon emission/absorption and dark intra- and intervalley excitonic states.