Topological Floquet Flat Bands in Irradiated Alternating Twist Multilayer Graphene
arXiv:2309.11685 · doi:10.1103/PhysRevB.108.165139
Abstract
We study the appearance of topological Floquet flat bands in alternating-twist multilayer graphene, which has alternating relative twist angle near the first magic angle. While the system hosts both flat bands and a steep Dirac cone in the static case, the circularly polarized laser beam can open a gap at the Moiré point and create Floquet flat bands carrying nonzero Chern numbers. Considering recent lattice-relaxation results, we find that the topological flat band is well-isolated for the effective interlayer tunneling in layers. Such dynamically produced topological flat bands are potentially observed in the experiment and thus provide a feasible way to realize the fractional Chern insulator.
arXiv comment8 pages,6 figures, published version
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