Bismuth iodide Bi4I4, composed of quasi-one-dimensional molecular chains, was theoretically predicted and now has been experimentally verified to be a novel strong topological insulator.
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Huang, H., Duan, W. Quasi-1D topological insulators. Nature Mater 15, 129–130 (2016). https://doi.org/10.1038/nmat4543
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DOI: https://doi.org/10.1038/nmat4543
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