Topological insulators have a conducting surface on which spin currents are not easily scattered, although the addition of magnetic impurities does affect electronic behaviour. But is this situation unique? Graphene comes to mind.
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Rotenberg, E. The dirt on topology. Nature Phys 7, 8–10 (2011). https://doi.org/10.1038/nphys1869
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DOI: https://doi.org/10.1038/nphys1869
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