Journal
SCIENCE
Volume 358, Issue 6363, Pages 648-651Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aao2521
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Funding
- National Science Foundation [DMR-1507788, DMR-1157490]
- David and Lucile Packard Foundation
- INDEX
- State of Florida
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1507788] Funding Source: National Science Foundation
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The distinct Landau level spectrum of bilayer graphene (BLG) is predicted to support a non-abelian even-denominator fractional quantum Hall (FQH) state similar to the (5)/(2) state first identified in GaAs. However, the nature of this state has remained difficult to characterize. Here, we report transport measurements of a robust sequence of even-denominator FQH in dual-gated BLG devices. Parallel field measurement confirms the spin-polarized nature of the ground state, which is consistent with the Pfaffian/anti-Pfaffian description. The sensitivity of the even-denominator states to both filling fraction and transverse displacement field provides new opportunities for tunability. Our results suggest that BLG is a platform in which topological ground states with possible non-abelian excitations can be manipulated and controlled.
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