Unidirectional plasmonic edge modes on general two-dimensional materials

T. Stauber, A. Nemilentsau, T. Low, G. Gómez-Santos

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We investigate the field and spin-momentum coupling of edge plasmons hosted by general two-dimensional materials and identify sweet spots depending on the polarisation plane, ellipticity and the position of an electric dipole relative to the plane and edge. Exciting the dipole at these sweet spots by propagating light leads to uni-directional propagating edge plasmons or edge modes suppression. We also extend previous approximate treatments (Fetter 1985 Phys. Rev. B 32 7676) to include anisotropy and hyperbolic systems, elucidating its predictions for the existence of edge modes. A thorough assessment of the approximate description is carried out, comparing its spin-momentum coupling features in the near field with exact results from Wiener-Hopf techniques. Simulations are also performed confirming the overall picture. Our results shed new light on the quest of chiral plasmonics in 2D materials and should be relevant for future experiments.

Original languageEnglish (US)
Article number045023
Journal2D Materials
Volume6
Issue number4
DOIs
StatePublished - Jul 24 2019

Bibliographical note

Publisher Copyright:
© 2019 IOP Publishing Ltd.

Keywords

  • graphene and 2D materials
  • plasmonic edge modes
  • spin-momentum coupling
  • surface plasmon polariton

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