The quantum spin Hall effect is predicted to be the result of two oppositely polarized spin currents travelling in opposite directions around the edges of a topological insulator. But only now has the spin polarization of these currents been confirmed.
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Zhou, Y., Zhang, FC. Left up right down. Nature Phys 8, 448–449 (2012). https://doi.org/10.1038/nphys2335
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DOI: https://doi.org/10.1038/nphys2335