Surface plasmons in doped topological insulators

Abstract

We investigate surface plasmons at a planar interface between a normal dielectric and a topological insulator, where the Fermi-energy lies inside the bulk gap of the topological insulator and gives rise to a two-dimensional charge distribution of free Dirac electrons. We develop the methodology for the calculation of plasmon dispersions, using the framework of classical electrodynamics, with modified constituent equations due to Hall currents in the topological insulator, together with a Lindhard-type description for the two-dimensional charge distribution of free Dirac electrons. For a system representative for Bi${}_2$X${}_3$ binary compounds, we find in agreement with recent related work that the modified constituent equations have practically no impact on the surface plasmon dispersion but lead to a rotation of the magnetic polarization of surface plasmons out of the interface plane.

5 pages, 2 figures

References in corpus (4)

• Dielectric function, screening, and plasmons in 2D graphene
• Dynamical polarization of graphene at finite doping
• Observation of Dirac plasmons in a topological insulator
• Proposal for a Topological Plasmon Spin Rectifier

Cited by in corpus (11)

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• Tunable Surface Plasmon Polaritons in a Weyl Semimetal Waveguide
• Axionic surface wave in dynamical axion insulators
• Plasmons in topological insulator cylindrical nanowires
• Controlling surface charge and spin density oscillations by Dirac plasmon interaction in thin topological insulators
• Surface plasmon polaritons in a waveguide composed of Weyl semimetals with different symmetries
• Tunable THz Surface Plasmon Polariton based on Topological Insulator-Layered Superconductor Hybrid Structure
• Plasmons in Z2 Topological Insulators
• Control of Plasmons in Topological Insulators via Local Perturbations
• Dynamical density response and collective modes of topological insulator ultra-thin films
• Control of Plasmons in Doped Topological Insulators via Basis Atoms