Even denominator fractional quantum Hall state in bilayer graphene
arXiv:1705.07846 · doi:10.1126/science.aao2521
Abstract
The multi-component nature of bilayer graphene (BLG), together with the ability to controllably tune between the various ground state orders, makes it a rich system in which to explore interaction driven phenomena. In the fractional quantum Hall effect (FQHE) regime, the unique Landau level spectrum of BLG is anticipated to support a non-Abelian even-denominator state that is tunable by both electric and magnetic fields. However, observation of this state, which is anticipated to be stronger than in conventional systems, has been conspicuously difficult. Here we report transport measurements of a robust even denominator FQHE in high-mobility, dual gated BLG devices. We confirm that the stability of the energy gap can be sensitively tuned and map the phase diagram. Our results establish BLG as a dynamic new platform to study topological ground states with possible non-Abelian excitations.
6 pages, 4 figures. v2, a typo has been corrected
References in corpus (9)
- Non-Abelian Anyons and Topological Quantum Computation
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
- Particle-hole symmetry and the Pfaffian state
- Particle-Hole Symmetry and the Quantum Hall State
- Tunable Fractional Quantum Hall Phases in Bilayer Graphene
- Orbital Landau level dependence of the fractional quantum Hall effect in quasi-two dimensional electron layers: finite-thickness effects
- Edge States and Interferometers in the Pfaffian and anti-Pfaffian States
- Controllable, driven phase transitions in the Fractional quantum Hall states in bilayer graphene