Plasmon reflections by topological electronic boundaries in bilayer graphene

Abstract

Domain walls separating regions of AB and BA interlayer stacking in bilayer graphene have attracted attention as novel examples of structural solitons, topological electronic boundaries, and nanoscale plasmonic scatterers. We show that strong coupling of domain walls to surface plasmons observed in infrared nanoimaging experiments is due to topological chiral modes confined to the walls. The optical transitions among these chiral modes and the band continua enhance the local ac conductivity, which leads to plasmon reflection by the domain walls. The imaging reveals two kinds of plasmonic standing-wave interference patterns, which we attribute to shear and tensile domain walls. We compute the electronic structure of both wall varieties and show that the tensile wall contain additional confined bands which produce a structure-specific contrast of the local conductivity. The calculated plasmonic interference profiles are in quantitative agreement with our experiments.

arXiv comment14 pages, 5 figures

References in corpus (21)

• Gate-tuning of graphene plasmons revealed by infrared nano-imaging
• Colloquium: Topological Band Theory
• The electronic properties of bilayer graphene
• Coulomb Interactions and Mesoscopic Effects in Carbon Nanotubes
• Strain Solitons and Topological Defects in Bilayer Graphene
• Topological confinement in bilayer graphene
• Generation and detection of pure valley current by electrically induced Berry curvature in bilayer graphene
• Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
• Determination of the electronic structure of bilayer graphene from infrared spectroscopy results
• Electronic and plasmonic phenomena at graphene grain boundaries
• Gate-controlled topological conducting channels in bilayer graphene
• Colloquium: Graphene spectroscopy
• Direct imaging of topological edge states at a bilayer graphene domain wall
• Electronic Highways in Bilayer Graphene
• Model for quantitative tip-enhanced spectroscopy and the extraction of nanoscale-resolved optical constants
• Topological kink states at a tilt boundary in gated multi-layer graphene
• Stacking boundaries and transport in bilayer graphene
• Electronic transmission through AB-BA domain boundary in bilayer graphene
• Generalized spectral method for near-field optical microscopy
• Dislocations in stacking and commensurate-incommensurate phase transition in bilayer graphene and hexagonal boron nitride
• Tunable plasmonic reflection by bound 1D electron states in a 2D Dirac metal

Cited by in corpus (16)

• Photonic crystals for nano-light in moiré graphene superlattices
• Relaxation and Domain Formation in Incommensurate 2D Heterostructures
• Collective excitations in twisted bilayer graphene close to the magic angle
• Nano-imaging photoresponse in a moiré unit cell
• Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene
• Coupled Wire description of the Correlated Physics in Twisted Bilayer Graphene
• Experimental observation of ABCB stacked tetralayer graphene
• Anisotropic Strain Induced Soliton Movement Changes Stacking Order and Bandstructure of Graphene Multilayers
• Plasmonic Dirac Cone in Twisted Bilayer Graphene
• Dual-gated graphene devices for near-field nano-imaging
• Gradient polaritonic surface with space-variant switchable light-matter interactions in 2D moire superlattices
• Giant resonant skew scattering of plasma waves in a two-dimensional electron gas
• Local Optical Conductivity of Bilayer Graphene with Kink Potential
• Anomalous skew scattering of plasmons in a Dirac electron fluid
• Twisted bilayer graphene as a terahertz plasmonic crystal
• Local optical conductivity of strain solitons in bilayer graphene with arbitrary soliton angle