The experimental observation of superconductivity that breaks spin-rotation symmetry in copper-doped Bi2Se3 provides a qualitatively distinct kind of unconventional superconducting behaviour — one that brings the importance of the spin–orbit interaction to the fore.
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Fu, L. Finding a direction. Nature Phys 12, 822–823 (2016). https://doi.org/10.1038/nphys3793
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DOI: https://doi.org/10.1038/nphys3793