Adding a spatially varying alternating magnetic field to layers of twisted graphene creates additional magic angles and flat bands

https://phys.org/news/2024-09-adding-alternating-magnetic-field-layers.html

"at specific twisted angles, by adjusting electron number, bilayer graphene acts as correlated insulator, superconductor where flat bands 2-fold degenerate (2 different quantum states having same energy)... this research introduces spatially alternating magnetic field where additional magic angles/ flat bands 4-fold degenerate... this higher degeneracy could potentially lead to even more correlated phenomena, and the magnetic phase offers an additional novel degree of freedom to tailor the electronic band structure"