Energy gaps and layer polarization of integer and fractional quantum Hall states in bilayer graphene

Abstract

Owing to the spin, valley, and orbital symmetries, the lowest Landau level (LL) in bilayer graphene exhibits multicomponent quantum Hall ferromagnetism. Using transport spectroscopy, we investigate the energy gaps of integer and fractional quantum Hall states in bilayer graphene with controlled layer polarization. The state at filling factor ν=1 has two distinct phases: a layer polarized state that has a larger energy gap and is stabilized by high electric field, and a hitherto unobserved interlayer coherent state with a smaller gap that is stabilized by large magnetic field. In contrast, the ν=2/3 quantum Hall state and a feature at ν=1/2 are only resolved at finite electric field and large magnetic field. These results underscore the importance of controlling layer polarization in understanding the competing symmetries in the unusual QH system of BLG.

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Cited by in corpus (15)

• Direct measurement of discrete valley and orbital quantum numbers in a multicomponent quantum Hall system
• Tunable quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene
• Quantum Hall Effect Measurement of Spin-Orbit Coupling Strengths in Ultraclean Bilayer Graphene/WSe2 Heterostructures
• Non-Abelian Parton Fractional Quantum Hall Effect in Multilayer Graphene
• Integer and Fractional Quantum Hall effect in Ultra-high Quality Few-layer Black Phosphorus Transistors
• Tunable Lifshitz Transitions and Multiband Transport in Tetralayer Graphene
• Effective Landau Level Diagram of Bilayer Graphene
• Tunable symmetries of integer and fractional quantum Hall phases in heterostructures with multiple Dirac bands
• Phase diagram of a graphene bilayer in the zero-energy Landau level
• Interplay between topological protected valley and quantum Hall edge transport
• Tunable Quantum Hall Edge Conduction in Bilayer Graphene through Spin-Orbit Interaction
• Symmetry characterization of the collective modes of the phase diagram of the $\nu =0$ quantum Hall state in graphene: Mean-field and spontaneously broken symmetries
• Helical Edge States and Quantum Phase Transitions in Tetralayer Graphene
• Spectroscopic Characterization of Landau Level Splitting and the Intermediate v = 0 Phase in Bilayer Graphene
• Featuring nuanced electronic band structure in gapped multilayer graphene