Journal
SCIENCE
Volume 373, Issue 6560, Pages 1257-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abc3534
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Funding
- European Graphene Flagship
- Swiss National Science Foundation through NCCR Quantum Science
- ERC Syngery Grant Quantropy
- ETH Fellowship program
- Elemental Strategy Initiative by Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST) [JPMJCR15F3]
- National Science Foundation (NSF) through the Center for Dynamics and Control of Materials, an NSF Materials Research Science and Engineering Center (MRSEC) [DMR-1720595]
- Welch Foundation [TBF1473]
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This study discovered a correlated electron-hole state in double-bilayer graphene twisted to 2.37 degrees, where moire states retain much of their isolated bilayer character. This allows the generation of an energetic overlap between narrow isolated electron and hole bands with good nesting properties, leading to the formation of ordered states with reconstructed Fermi surfaces consistent with a density-wave state that can be tuned without introducing chemical dopants.
When twisted to angles near 1 degrees, graphene multilayers provide a window on electron correlation physics. Here, we report the discovery of a correlated electron-hole state in double-bilayer graphene twisted to 2.37 degrees. At this angle, the moire states retain much of their isolated bilayer character, allowing their bilayer projections to be separately controlled by gates. We use this property to generate an energetic overlap between narrow isolated electron and hole bands with good nesting properties. Our measurements reveal the formation of ordered states with reconstructed Fermi surfaces, consistent with a density-wave state. This state can be tuned without introducing chemical dopants, enabling studies of correlated electron-hole states and their interplay with superconductivity.
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