Localized Plasmons in Topological Insulators

Abstract

We investigate in a fully quantum-mechanical manner how the many-body excitation spectrum of topological insulators is affected by the presence of long-range Coulomb interactions. In the one-dimensional Su-Schrieffer-Heeger model and its mirror-symmetric variant strongly localized plasmonic excitations are observed which originate from topologically non-trivial single-particle states. These \textit{"topological plasmons"} inherit some of the characteristics of their constituent topological single-particle states, but they are not equally well protected against disorder due to the admixture of non-topological bulk single-particle states in the polarization function. The strength of the effective Coulomb interactions is also shown to have strong effects on the plasmonic modes. Furthermore, we show how external modifications via dielectric screening and applied electric fields with distinct symmetries can be used to study topological plasmons, thus allowing for experimental verification of our atomistic predictions.

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Cited by in corpus (7)

• Topological Photonic Tamm-States and the Su-Schrieffer-Heeger Model
• Topological Graphene plasmons in a plasmonic realization of the Su-Schrieffer-Heeger Model
• Plasmons in Two-Dimensional Topological Insulators
• Plasmonic Waveguides from Coulomb-Engineered Two-Dimensional Metals
• Plasmons in Z2 Topological Insulators
• Control of Plasmons in Topological Insulators via Local Perturbations
• Control of Plasmons in Doped Topological Insulators via Basis Atoms