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The multi-component nature of bilayer graphene (BLG), together with theability to controllably tune between the various ground state orders, makes ita rich system in which to explore interaction driven phenomena. In thefractional quantum Hall effect (FQHE) regime, the unique Landau level spectrumof BLG is anticipated to support a non-Abelian even-denominator state that istunable by both electric and magnetic fields. However, observation of thisstate, which is anticipated to be stronger than in conventional systems, hasbeen conspicuously difficult. Here we report transport measurements of a robusteven denominator FQHE in high-mobility, dual gated BLG devices. We confirm thatthe stability of the energy gap can be sensitively tuned and map the phasediagram. Our results establish BLG as a dynamic new platform to studytopological ground states with possible non-Abelian excitations.

Even denominator fractional quantum Hall state in bilayer graphene