Tunable plasmonic reflection by bound 1D electron states in a 2D Dirac metal

Abstract

We show that surface plasmons of a two-dimensional Dirac metal such as graphene can be reflected by line-like perturbations hosting one-dimensional electron states. The reflection originates from a strong enhancement of the local optical conductivity caused by optical transitions involving these bound states. We propose that the bound states can be systematically created, controlled, and liquidated by an ultranarrow electrostatic gate. Using infrared nanoimaging, we obtain experimental evidence for the locally enhanced conductivity of graphene induced by a carbon nanotube gate, which supports this theoretical concept.

14 pages, 12 figures, submitted to PRL

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• Nano-photocurrent mapping of local electronic structure in twisted bilayer graphene
• Two-dimensional Dirac particles in a Pöschl-Teller waveguide
• Guiding Dirac fermions in graphene with a carbon nanotube
• Theory of plasmon reflection by a 1D junction
• Tailored plasmons in pentacene/graphene heterostructures with interlayer electron transfer
• Electrons imitating light: Frustrated supercritical collapse in charged arrays on graphene
• Dual-gated graphene devices for near-field nano-imaging
• Lippmann-Schwinger theory for two-dimensional plasmon scattering
• Chiral interface states in graphene $p$-$n$ junctions
• Perfectly Conducting Graphene Electronic Waveguide with Curved Channels
• Dislocation and node states in bilayer graphene systems
• Anomalous skew scattering of plasmons in a Dirac electron fluid