Tunable quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene

Abstract

The quantum anomalous Hall (QAH) effect - a macroscopic manifestation of chiral band topology at zero magnetic field - has only been experimentally realized by magnetic doping of topological insulators (1 - 3) and delicate design of Moire heterostructures (4 - 8). However, the seemingly simple bilayer graphene without magnetic doping or Moire engineering has long been predicted to host competing ordered states with QAH effects (9 - 11). Here, we explore states in bilayer graphene with conductance of 2 e2/h that not only survive down to anomalously small magnetic fields and up to temperatures of 5 K, but also exhibit magnetic hysteresis. Together, the experimental signatures provide compelling evidence for orbital magnetism driven QAH behavior with a Chern number tunable via electric and magnetic fields as well as carrier sign. The observed octet of QAH phases is distinct from previous observations due to its peculiar ferrimagnetic and ferrielectric order that is characterized by quantized anomalous charge, spin, valley, and spin-valley Hall behavior.

References in corpus (10)

• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Current-induced cleaning of graphene
• Surface State Magnetization and Chiral Edge States on Topological Insulators
• Quantum Anomalous Hall State in Bilayer Graphene
• Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene
• Intra-Landau level Cyclotron Resonance in Bilayer Graphene
• Conformal Invariance and Shape-Dependent Conductance of Graphene Samples
• Giant anomalous Hall effect in quasi-two-dimensional layered antiferromagnet Co${}_{1/3}$NbS${}_2$
• Transconductance fluctuations as a probe for interaction induced quantum Hall states in graphene
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• Origin of Model Fractional Chern Insulators in All Topological Ideal Flatbands: Explicit Color-entangled Wavefunction and Exact Density Algebra
• Superconductivity from electronic interactions and spin-orbit enhancement in bilayer and trilayer graphene
• Exact Many-Body Ground States from Decomposition of Ideal Higher Chern Bands: Applications to Chirally Twisted Graphene Multilayers
• Interaction-driven topological phase diagram of twisted bilayer MoTe${}_2$
• Simulation of interaction-induced chiral topological dynamics on a digital quantum computer
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• Moiré-driven multiferroic order in twisted CrCl${}_3$, CrBr${}_3$ and CrI${}_3$ bilayers
• Electrical control of spin and valley in spin-orbit coupled graphene multilayers
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• Emergent correlated phases in rhombohedral trilayer graphene induced by proximity spin-orbit and exchange coupling
• Probing the tunable multi-cone bandstructure in Bernal bilayer graphene
• Interaction-driven (quasi-) insulating ground states of gapped electron-doped bilayer graphene
• Electric Field Tunable Band Gap in Commensurate Twisted Bilayer Graphene
• de Haas-van Alphen spectroscopy and fractional quantization of magnetic-breakdown orbits in moiré graphene
• Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene
• Swapping exchange and spin-orbit induced correlated phases in proximitized Bernal bilayer graphene
• Quarter Metal Superconductivity
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• Linear and Non-Linear Response of Quadratic Lindbladians
• Fano resonances for tilted linear and quadratic band touching dispersions in a harmonically driven potential well
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• Electronic and Spin-Orbit Properties of hBN Encapsulated Bilayer Graphene
• Acoustic phonon-restricted four-phonon interactions: Impact on thermal and thermoelectric transport in monolayer h-NbN
• Orbital Hall Conductivity in a Graphene/Haldane and Haldane/Haldane Bilayers
• Terahertz Landau level spectroscopy of Dirac fermions in millimeter-scale twisted bilayer graphene
• Hexagonal boron nitride/bilayer graphene moiré superlattices in the Dirac-material family: energy-band engineering and carrier doping by dual gating
• Binding and spontaneous condensation of excitons in narrow-gap carbon nanotubes
• Quantum anomalous Hall effect with high Chern number in two dimensional ferromagnets Ti2TeSO