SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 1: 2D Materials I (joint session HL/CPP)
HL 1.9: Talk
Monday, March 27, 2023, 12:00–12:15, POT 81
Strong exciton-plasmon coupling in hybrids of 2D semiconductors and plasmonic crystals — •Lara Greten1, Robert Salzwedel1, Stephen Hughes2, Malte Selig1, and Andreas Knorr1 — 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Germany — 2Department of Physics, Queen's University, Kingston, Canada
Monolayers of transition metal dichalcogenides (TMDCs) are direct-gap semiconductors that exhibit tightly bound excitons with pronounced optical amplitudes. Thus, they are promising for various optoelectronic applications and an excellent material to investigate excitons. Another material with a large optical amplitude is a plasmonic crystal - arrays of metal nanoparticles - which supports collective plasmon modes, and yields amplification of the electric fields on the nano-scale.
Here, we theoretically consider exciton-plasmon coupling in a hybrid structure of a TMDC layer interacting with a plasmonic crystal with a 2d lattice. Our study reveals a hybridization of plasmons and initially momentum dark excitons. In addition, we find an excitonic mode with negligible coupling to the plasmonic near field, emitting undisturbed radiation into the far field. To connect to related experiments, we compute the scattered light in the near- and far-field explicitly and identify signatures of strong exciton-plasmon coupling with a Rabi splitting of more than 100 meV. We also find that the uncoupled exciton mode results in a third peak at the undisturbed exciton energy.