Emergent magnetic texture in driven twisted bilayer graphene
Dario A. Bahamon, G. Gómez-Santos, T. Stauber
Abstract
The transport properties of a twisted bilayer graphene barrier are investigated for various twist angles. Remarkably, for small twist angles around the magic angle θm ∼ 1.05°, the local currents around the AA-stacked regions are strongly enhanced compared to the injected electron rate. Furthermore, the total and counterflow (magnetic) current patterns show high correlations in these regions, giving rise to well-defined magnetic moments that form a magnetic Moiré superlattice. The orientation and magnitude of these magnetic moments change as a function of the gate voltage and possible implications for emergent spin-liquid behaviour are discussed.
Topics & Concepts
Bilayer grapheneCondensed matter physicsTwistMaterials scienceBilayerGrapheneOrientation (vector space)Magnetic momentTexture (cosmology)Magnetic fieldMagic angleVoltageHysteresisMagnetic hysteresisCurrent (fluid)Function (biology)ElectronElectric currentRectangular potential barrierMagnetic domainInsulator (electricity)Gate voltageGraphene research and applicationsChemical and Physical Properties of MaterialsTheoretical and Computational Physics