Ferromagnetic Mott state in Twisted Graphene Bilayers at the Magic Angle
Related Experiment Video
Updated: Jan 22, 2026

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
Kangjun Seo1, Valeri N Kotov2, Bruno Uchoa1
1Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73069, USA.
Abstract:
We address the effective tight-binding Hamiltonian that describes the insulating Mott state of twisted graphene bilayers at a magic angle. In that configuration, twisted bilayers form a honeycomb superlattice of localized states, characterized by the appearance of flat bands with fourfold degeneracy. After calculating the maximally localized superlattice Wannier wave functions, we derive the effective spin model that describes the Mott state. We suggest that the system is an exotic ferromagnetic Mott insulator, with well-defined experimental signatures.
Related Concept Videos
Angle of Twist: Problem Solving
Angle of Twist - Elastic Range
Ferromagnetism
Magical Thinking
Contact Angle
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
Open Angle Glaucoma: Treatment
Drugs such as carbonic anhydrase inhibitors, α2- and...

