In an atomically thin stack of semiconductors, a mechanism unseen in any natural substance causes electrons’ spins to align.
In 1966, the Japanese physicist Yosuke Nagaoka conceived of a type of magnetism produced by a seemingly unnatural dance of electrons within a hypothetical material. Now, a team of physicists has spotted a version of Nagaoka’s predictions playing out within an engineered material only six atoms thick.
For example, in 2018 the physicist Pablo Jarillo-Herrero and his colleagues demonstrated that two-layer stacks of graphene gained the ability to superconduct when they offset the two layers with a twist. Moiré materials have since emerged as a compelling new system in which to study magnetism, slotted in alongside clouds of supercooled atoms and complex materials such as cuprates.
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