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arXiv · 2504.08082

Hybridization of edge modes with substrate phonons

Azat F. Aminov·Alexey A. Sokolik
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Abstract

Surface plasmons or phonons propagating on a two-dimensional (2D) material can exhibit coupling with resonant excitations in its substrate, and the resulting coupled modes were extensively studied. Similar coupling of edge modes propagating along a boundary of 2D material with the substrate excitations remains unexplored. This paper aims to bridge this gap by investigating the edge-substrate hybrid modes using the exact Wiener-Hopf analytical approach. We analyze dispersions, decay rate, and confinement of such hybrid modes both without magnetic field (plasmon-phonon and phonon-phonon hybrid modes) and in quantizing magnetic field where edge magnetoplasmons hybridize with substrate phonons. The hybrid modes are predicted to occur in THz and far-IR ranges for several combinations of quasi-2D materials (single- and bilayer graphene, quantum wells, thin-film semiconductors) and substrates with polar-phonon resonances.

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Azat F. Aminov, Alexey A. Sokolik. 2025-03-28. Hybridization of edge modes with substrate phonons. https://doi.org/10.1364/ol.563799

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