Put two types of crystal together in one lattice, and the resulting material can have properties greater than the sum of those of its individual components. Until now, that's been a difficult trick to pull off on a large scale.
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Heath, J. Synergy in a superlattice. Nature 445, 492–493 (2007). https://doi.org/10.1038/445492a
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DOI: https://doi.org/10.1038/445492a
