Journal
NANO LETTERS
Volume 19, Issue 4, Pages 2371-2376Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b05061
Keywords
hBN encapsulated graphene; moire superlattice; three-layer moire pattern; superlattice Dirac point; twistronics
Categories
Funding
- Swiss Nanoscience Institute (SNI)
- ERC project TopSupra [787414]
- European Union [696656]
- Swiss National Science Foundation
- Topograph
- ISpinText FlagERA network
- OTKA [FK-123894]
- Bolyai Fellowship
- Marie Curie grant
- National Research, Development and Innovation Fund of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]
- MOST [107-2112-M-006-004-MY3]
- Elemental Strategy Initiative
- CREST, JST [JPMJCR15F3]
- Swiss NCCR QSIT
- European Research Council (ERC) [787414] Funding Source: European Research Council (ERC)
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The specific rotational alignment of two-dimensional lattices results in a moire superlattice with a larger period than the original lattices and allows one to engineer the electronic band structure of such materials. So far, transport signatures of such superlattices have been reported for graphene/hBN and graphene/graphene systems. Here we report moire superlattices in fully hBN encapsulated graphene with both the top and the bottom hBN aligned to the graphene. In the graphene, two different moire superlattices form with the top and the bottom hBN, respectively. The overlay of the two superlattices can result in a third superlattice with a period larger than the maximum period (14 nm) in the graphene/hBN system, which we explain in a simple model. This new type of band structure engineering allows one to artificially create an even wider spectrum of electronic properties in two-dimensional materials.
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