Events

"Modeling fractional Chern insulators in rhombohedral graphene"

Fractional Chern insulators (FCIs), the zero magnetic field cousins of the fractional quantum Hall effect, have recently been experimentally realized 15 years after their theoretical proposal. The first system where they were observed, twisted MoTe2, is in line with the usual toy model picture: A fractionally filled isolated band carrying a non-zero Chern number akin to a Landau level. But FCIs in rhombohedral graphene on aligned hBN substrate do not fall into this simple picture. The naive band structure is gapless pointing out the highly non trivial role of interactions. In this talk, we will give an overview of the current understanding of FCIs in rhombohedral graphene and the shortcomings of current models. We will present possible routes to stabilize an FCI that will potentially stress the missing physical ingredients.