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Institute for Condensed Matter Theory Seminar: Moiréology of Multilayer Graphene with a superlattice potential

Event Type
The Institute for Condensed Matter Theory
Nov 14, 2022   12:00 pm  
Sayed Ghorashi, Stonybrook University
Originating Calendar
Physics - Institute for Condensed Matter Theory Seminar

I will talk about an alternative route towards generating flat bands using a superlattice potential. I will show that bilayer graphene in the presence of a 2D superlattice potential provides a highly tunable setup that can realize a variety of flat band phenomena. We focus on two regimes: (i) topological flat bands with non-zero Chern numbers, C, including bands with higher Chern numbers |C| > 1; and (ii) an unprecedented phase consisting of a stack of nearly flat bands with C = 0. For realistic values of the potential and superlattice periodicity, this stack can span nearly 100 meV, encompassing nearly all of the low-energy spectrum. I will then present results on generalizing this approach to multilayer graphene. Our results provide a realistic guide for future experiments to realize a new platform for flat band phenomena. 

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