Plasmons in anisotropic Dirac systems
Materials Science
2021-02-10 v3
Abstract
We consider the plasmon excitations in anisotropic two-dimensional Dirac systems, be it either anisotropic graphene or surfaces of topological insulators. Generalizing the exact density-density response function one finds a plasmon dispersion that is anisotropic already at the lowest frequencies. Asymptotic expressions are obtained for the dispersion in this regime. We show that the plasmon properties of the complete material class of anisotropic Dirac systems are characterized by just two dimensionless material parameters. The strong anisotropy can be used to guide the plasmon modes, introducing new functionalities to the field of Dirac plasmonics.
Cite
@article{arxiv.2007.08843,
title = {Plasmons in anisotropic Dirac systems},
author = {Roland Hayn and Te Wei and Vyacheslav M. Silkin and Jeroen van den Brink},
journal= {arXiv preprint arXiv:2007.08843},
year = {2021}
}
Comments
5 pages, 4 figures