According to theory, electrons on the surface of a topological insulator are not allowed to make U-turns. This notion, and some of its main consequences, has now been tested experimentally.
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Franz, M. U-turns strictly prohibited. Nature 466, 323–324 (2010). https://doi.org/10.1038/466323a
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DOI: https://doi.org/10.1038/466323a
