Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 14: 2D Materials: Session II (joint session DS/CPP/HL)

HL 14.11: Talk

Tuesday, March 13, 2018, 12:15–12:30, H 2032

Band structure engineered layered metals for low-loss plasmonics — •Morten Gjerding — DTU Physics, Fysikvej building 311, 2800 Kgs. Lyngby

Plasmonics currently faces the problem of seemingly inevitable optical losses occurring in the metallic components that challenges the implementation of essentially any application. In this work, we show that Ohmic losses are reduced in certain layered metals, such as the transition metal dichalcogenide TaS₂, due to an extraordinarily small density of states for scattering in the near-IR originating from their special electronic band structure. On the basis of this observation, we propose a new class of band structure engineered van der Waals layered metals composed of hexagonal transition metal chalcogenide-halide layers with greatly suppressed intrinsic losses. Using first-principles calculations, we show that the suppression of optical losses lead to improved performance for thin-film waveguiding and transformation optics.