Topological Floquet Flat Bands in Irradiated Alternating Twist Multilayer Graphene

• URL: http://arxiv.org/abs/2309.11685v2
• Date: Sat, 21 Oct 2023 06:45:16 GMT
• Title: Topological Floquet Flat Bands in Irradiated Alternating Twist Multilayer Graphene
• Authors: Yingyi Huang
• Abstract summary: We study the appearance of topological Floquet flat bands in alternating-twist multilayer graphene. Laser beam can open a gap at the Moir'e $K$ point and create Floquet flat bands carrying nonzero Chern numbers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the appearance of topological Floquet flat bands in alternating-twist multilayer graphene, which has alternating relative twist angle $\pm\theta$ 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 Moir\'{e} $K$ 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 $n=3, 4, 5$ 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.

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