Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 2: 2D Materials and Heterostructures: Photonic Aspects

HL 2.7: Vortrag

Montag, 18. März 2024, 11:15–11:30, EW 201

Magnification of Plasmon Resonances in Monolayer MoS2 via Conjugated Molecular Adsorbates — Juan Pablo Guerrero-Felipe¹, •Ana M. Valencia^2,3, and Caterina Cocchi^2,3 — ¹Department of Physics, Freie Universität Berlin — ²Institut für Physik, Carl von Ossietzky Universität Oldenburg — ³Physics Department and IRIS Adlershof, Humboldt-Universität zu Berlin

The adsorption of carbon-conjugated molecules represents an established route to tune the electronic and optical properties of transition metal dichalcogenide (TMDC) monolayers. Here, we demonstrate from the first principles such a functionalization with prototypical compounds pyrene and tetracene enhance the magnitude of selected plasmon resonances in the MoS2 layer, without significantly altering their energy and dispersion. Our results indicate that such a magnification can be achieved by proper alignment of the molecules concerning the direction of the transferred momentum. The distinct signatures in the loss function of the interface compared to those of its constituents suggest not only the presence of non-negligible interactions between them but also the possibility of using electron energy loss spectroscopy to detect the presence and the orientation of molecular adsorbates on TMDCs. J.P. Guerrero-Felipe, et al., arXiv:2311.17613 [cond-mat.mtrl-sci]