Heat treatment can transform some moiré superlattices into fully commensurate bilayers, where atoms in opposite layers align perfectly with each other. This structural transformation gives rise to markedly brighter interlayer excitons.
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Lui, C.H. Transforming into fully commensurate bilayers. Nat. Mater. 22, 1435–1436 (2023). https://doi.org/10.1038/s41563-023-01730-x
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DOI: https://doi.org/10.1038/s41563-023-01730-x