SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 1: 2D Materials I (joint session HL/CPP)
HL 1.4: Talk
Monday, March 27, 2023, 10:15–10:30, POT 81
Theory of exciton localization in TMDCs using metal nanoparticles — •Robert Salzwedel1, Lara Greten1, Stefan Schmidt1, Chelsea Carlson2, Stephen Hughes2, Malte Selig1, and Andreas Knorr1 — 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Berlin, Germany — 2Department of Physics, Queen's University, Kingston, Ontario, Canada
In recent years, monolayers of transition metal dichalcogenides (TMDCs) have attracted considerable attention due to their strong Coulomb and light-matter interactions, leading to tightly bound excitons with large optical oscillator strength. Due to the finite thickness of the monolayers, these excitons are very sensitive to the environment, which allows their properties to be tailored, e.g., by functionalization with molecules or metal nanoparticles (MNPs) [1,2].
We present a theory based on a self-consistent solution of Maxwell's and Bloch equations to analytically study a coupled system of MNP plasmons and TMDC excitons. For the combined system, we identify an effective eigenvalue equation that governs the center of mass motion of the dressed excitons in a plasmon-induced potential. Examination of the ensuing plexcitonic equation reveals the existence of bound states, which we interpret as excitons localized in the external potential. The appearance of these bound states in this potential is an indicator of strong coupling between excitons and plasmons.
[1] Carlson et al. (2021). PRB, 104(12), 125424.
[2] Denning et al. (2022). PRB, 105(8), 085306.