Plasmons in anisotropic Dirac systems

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.

5 pages, 4 figures

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Cited by in corpus (5)

• Anisotropic effects in two-dimensional materials
• Finite-temperature plasmons, damping and collective behavior for $\alpha -{\mathcal{T}}_3$ model
• Hyperbolic plasmon modes in tilted Dirac cone phases of borophene
• Dynamical polarization, optical conductivity and plasmon mode of a linear triple component fermionic system
• Surface plasmonics of Weyl semimetals