Carbon nanotubes are not superconductors but they can carry a supercurrent injected from a superconducting contact. Analysis of the tunnelling spectra of a nanotube connecting two superconductors reveals details of the bound electron–hole states that carry such a supercurrent.
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Belzig, W. Bound in a nanotube. Nature Phys 6, 940–941 (2010). https://doi.org/10.1038/nphys1855
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DOI: https://doi.org/10.1038/nphys1855
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