Emergent magnetic texture in driven twisted bilayer graphene
D. A. Bahamon, G. G\'omez-Santos, and T. Stauber
TL;DR
This paper explores how twisted bilayer graphene exhibits emergent magnetic textures near the magic angle, with local currents and magnetic moments forming a superlattice influenced by gate voltage, revealing potential for novel magnetic states.
Contribution
It uncovers the formation of magnetic Moiré superlattices in twisted bilayer graphene at small twist angles, highlighting the interplay between local currents and magnetic moments.
Findings
Enhanced local currents around AA regions at small twist angles.
Formation of magnetic Moiré superlattices with well-defined magnetic moments.
Magnetic moments' orientation and magnitude depend on gate voltage.
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 , 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, given rise to well-defined magnetic moments that form a magnetic Moir\'e superlattice. The orientation and magnitude of these magnetic moments changes as function of the gate voltage and possible implications for emergent spin-liquid behaviour are discussed.
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