期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.086807
关键词
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资金
- Army Research Office (ARO) [W911NF-16-1-0319]
- National Science Foundation (NSF) [DMR-1741788, DMR-1719875]
- Cornell Fellowship
- Kwanjeong Fellowship from the Kwanjeong Educational Foundation
A valley plasmonic crystal for graphene surface plasmons is proposed. We demonstrate that a designer metagate, placed within a few nanometers of graphene, can be used to impose a periodic Fermi energy landscape on graphene. For specific metagate geometries and bias voltages, the combined metagate-graphene structure is shown to produce complete propagation band gaps for the plasmons, and to impart them with nontrivial valley-linked topological properties. Sharply curved domain walls between differently patterned metagates are shown to guide highly localized plasmons without any reflections owing to suppressed intervalley scattering. Our approach paves the way for nonmagnetic and dynamically reconfigurable topological nanophotonic devices.
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