期刊
SCIENCE
卷 362, 期 6419, 页码 1153-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau5144
关键词
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资金
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0019443]
- DOE, BES [DE-SC0018426]
- DARPA EXTREME program [HR001110720034]
- AFOSR [FA9550-15-1-0478]
- Gordon and Betty Moore Foundation investigators in the Quantum Materials EPIQS program [GBMF4533, GBMF4543]
- ARO [W911NF-17-1-0574]
- ONR MURI [N00014-15-1-2761]
- Ministerio de Economia y Competitividad, Spain [FIS2017-82260-P]
- Elemental Strategy Initiative, MEXT, Japan
- ONR [NO00014-18-1-2722]
- CREST, JST [JPMJCR15F3]
- DOE-BESD [E-SC0018218]
- [ONR-NO00014-18-1-2722]
Graphene is an atomically thin plasmonic medium that supports highly confined plasmon polaritons, or nano-light, with very low loss. Electronic properties of graphene can be drastically altered when it is laid upon another graphene layer, resulting in a moire superlattice. The relative twist angle between the two layers is a key tuning parameter of the interlayer coupling in thus-obtained twisted bilayer graphene (TBG). We studied the propagation of plasmon polaritons in TBG by infrared nano-imaging. We discovered that the atomic reconstruction occurring at small twist angles transforms the TBG into a natural plasmon photonic crystal for propagating nano-light. This discovery points to a pathway for controlling nano-light by exploiting quantum properties of graphene and other atomically layered van der Waals materials, eliminating the need for arduous top-down nanofabrication.
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