Many two-dimensional (2D) materials—ultrathin films or atom-thick sheets—exhibit superconducting critical temperatures and current densities that can vastly exceed those of conventional superconductors. To date, however, there isn’t a theory that successfully explains these materials’ unconventional superconductivity and that could guide the search for better 2D superconductors. Now, Valentin Crépel of the Massachusetts Institute of Technology (MIT) and co-workers have shown that a novel model, based on a strong electron-coupling mechanism, holds promise for filling this gap [1]. The model may also help in understanding the superconductivity of twisted bilayer graphene, which remains unexplained despite feverish research efforts since its discovery in 2018.
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