Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 51: 2D Materials: Session III (joint session DS/CPP/HL)

HL 51.3: Vortrag

Freitag, 16. März 2018, 10:15–10:30, H 2032

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 Knorr11Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Berlin, Germany — 2Chalmers University of Technology, Department of Physics, Gothenburg, Sweden — 3Physikalisches Institut und Zentrum für Nanotechnologie, Universität Münster, 48149 Münster, Germany

Monolayers of transition metal dichalcogenides (TMDs) show an extraordinarily strong Coulomb interaction, leading to the formation of tightly bound excitons. Because of a complex quasi-particle band structure, TMDs possess a variety of bright sates (addressable by light) and dark states (addressable by phonons). Here, we present a joint experiment-theory study on the influence of exciton-radiative and exciton-phonon interaction on the absorption line shape of different monolayer TMD materials. Solving the TMD Bloch equations in the quantum kinetic limit, we predict the appearance of spectrally asymmetric phonon-induced sidebands that are accompanied by a pronounced polaron-red shift. We analyze the influence of the interplay of phonon emission/absorption processes and dark intra- and intervalley excitonic states on the asymmetry of the absorption line shape.

D. Christiansen, et. al, Phys. Rev. Lett. 119, 187402 (2017)

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