Journal
NATIONAL SCIENCE REVIEW
Volume 7, Issue 2, Pages 248-253Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwz212
Keywords
band modulation; periodic potential; bilayer graphene
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the van der Waals Heterostructures Program [KCWF16, DEAC02-05-CH11231]
- National Science Foundation (NSF) MRI grant [1725335]
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research award [OSR-2016-CRG5-2996]
- NSF [EFMA-1741660]
- Elemental Strategy Initiative by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- CREST, Japan Science and Technology Agency (JST) [JPMJCR15F3]
- Direct For Mathematical & Physical Scien [1725335] Funding Source: National Science Foundation
- Division Of Materials Research [1725335] Funding Source: National Science Foundation
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Band structure determines the motion of electrons in a solid, giving rise to exotic phenomena when properly engineered. Drawing an analogy between electrons and photons, artificially designed optical lattices indicate the possibility of a similar band modulation effect in graphene systems. Yet due to the fermionic nature of electrons, modulated electronic systems promise far richer categories of behaviors than those found in optical lattices. Here, we uncovered a strong modulation of electronic states in bilayer graphene subject to periodic potentials. We observed for the first time the hybridization of electron and hole sub-bands, resulting in local band gaps at both primary and secondary charge neutrality points. Such hybridization leads to the formation of flat bands, enabling the study of correlated effects in graphene systems. This work may provide a novel way to manipulate electronic states in layered systems, which is important to both fundamental research and application.
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