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HL: Fachverband Halbleiterphysik

HL 74: Poster IIIA

HL 74.2: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/2OG

Theory of near-field optics in transition metal dichalcogenides — •Robert Salzwedel, Andreas Knorr, and Malte Selig — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

In recent years transition metal dichalcogenides (TMDCs) attracted much attention due to their strong Coulomb and light matter interaction leading to tightly bound excitons with large optical oscillator strength. Due to their finite thickness, those excitons have been shown to be very sensitive to their environment, for instance to a change in their dielectric surrounding [1] or the deposition of a self assembled layer of molecules [2].

Here we present a microscopic theory which is based on a self consistent solution of Maxwell and Bloch equations to study phenomena which are associated with the nearby environment of the TMDC layer, for instance the trapping of excitons by external molecules placed on top of the layer. As an outlook, our approach also allows the description of the launch of in-plane exciton-polaritons and their propagation through the layer.

[1] P. Steinleitner et al., Nano Lett.18, 1402 (2018)

[2] M. Feierabend et al., Nat. Commun. 8, 14776 (2017)