Emergent magnetic texture in driven twisted bilayer graphene

The transport properties of a twisted bilayer graphene barrier are investigated for various twist angles. Remarkably, for small twist angles around the magic angle m ∼ 1.05°, the local currents around the AA-stacked regions are strongly enhanced compared to the injected electron rate. Furthermore, t...

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Bibliographic Details
Published in:Nanoscale 2020-07, Vol.12 (28), p.15383-15392
Main Authors: Bahamon, Dario A, Gómez-Santos, G, Stauber, T
Format: Article
Language:English
Subjects:
Bilayers
Continuum modeling
Counterflow
Current distribution
Graphene
Magnetic moments
Superlattices
Transport properties
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Summary:The transport properties of a twisted bilayer graphene barrier are investigated for various twist angles. Remarkably, for small twist angles around the magic angle m ∼ 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. A superlattice of magnetic moments appears for low twist angles in twisted bilayer graphene under asymmetric driving.
ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr02786c