Journal
PHYSICAL REVIEW B
Volume 104, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.235130
Keywords
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Funding
- Chinese National Key Research and Development Program [2018FYA0305800]
- Ministry of Science and Technology of China [2018YFA0307000]
- National Natural Science Foundation of China [U2032128, 11874047, 11774268]
- Fundamental Research Funds for the Central Universities [2042021kf0210]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB30000000]
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The study reports evidence of a high-order moire effect and multiple Dirac cone replicas on a graphene-SiC heterostructure. Despite a weak first-order moire effect due to large lattice mismatch and rotation angle, a high-order moire effect with a 1.9 nm periodicity is experimentally observed, along with Dirac cone replicas with momentum transfer by second- and third-order reciprocal lattice vectors. This demonstrates the potential to engineer moire systems without the limitation of small lattice constant mismatches.
Moire potential has become a powerful tool to modulate electronic structures and realize quantum phases. Authors of previous studies mainly focused on the first-order moire effect in systems with small lattice mismatches and rotation angles. Here, we report evidence of a high-order moire effect and multiple Dirac cone replicas by performing angle-resolved photoemission spectroscopy on a graphene-SiC heterostructure. Despite that the first-order moire effect is weak due to large lattice mismatch and rotation angle, a high-order moire effect with a 1.9 nm periodicity in real-space is experimentally observed. Different from previously studied first-order moire systems, in which only replicas with momentum transfer by the primitive reciprocal lattice vectors were observed, Dirac cone replicas with momentum transfer by second- and third-order reciprocal lattice vectors are experimentally identified. Our results not only demonstrate the high-order moire effect in a graphene-SiC heterostructure but also provide opportunities to engineer moire systems without the limitation of small lattice constant mismatches.
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