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(Funded by the National Science Foundation)
Physicists shed light on a novel Mott state observed in twisted graphene bilayers at the “magic angle.” The novel Mott state favors ferromagnetic alignment of the electron spins, meaning that the spins of pairs of electrons are aligned parallel to each other, even though these electrons strongly repel each other – a phenomenon unheard of in conventional Mott insulators, in which the spins of two electrons sitting next to each other are anti-parallel.
