Plasmon Reflections by Topological Electronic Boundaries in Bilayer Graphene
| Autor: | Philip Kim, Guangxin Ni, Michael M. Fogler, Dimitri Basov, Jing Shi, Xiaomeng Liu, Shu Yang Frank Zhao, Eugene J. Mele, Zachariah Addison, Bor-Yuan Jiang |
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| Rok vydání: | 2017 |
| Předmět: |
Nanoplasmonics
Materials science Stacking FOS: Physical sciences Physics::Optics Bioengineering 02 engineering and technology Electronic structure Topology 01 natural sciences 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) cond-mat.mes-hall MD Multidisciplinary General Materials Science bilayer graphene Nanoscience & Nanotechnology 010306 general physics Plasmon Coupling Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Scattering Mechanical Engineering Surface plasmon General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics plasmon reflection Reflection (mathematics) structural solitons scanning near-field microscopy topological electronic boundaries 0210 nano-technology Bilayer graphene Biotechnology |
| Zdroj: | Nano letters, vol 17, iss 11 Jiang, Bor-Yuan; Ni, Guang-Xin; Addison, Zachariah; Shi, Jing K; Liu, Xiaomeng; Zhao, Shu Yang Frank; et al.(2017). Plasmon Reflections by Topological Electronic Boundaries in Bilayer Graphene. NANO LETTERS, 17(11), 7080-7085. doi: 10.1021/acs.nanolett.7b03816. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/2cm1138j |
| DOI: | 10.1021/acs.nanolett.7b03816. |
| Popis: | 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. Comment: 14 pages, 5 figures |
| Databáze: | OpenAIRE |
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