Despite more than a decade of study, single-wall carbon nanotubes still have the ability to surprise. One recent study finds that in ultraclean nanotubes an unexpectedly strong spin–orbit coupling arises; another demonstrates their ability to support one-dimensional Wigner crystals.
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Nygård, J. Old nanotubes, new tricks. Nature Phys 4, 266–267 (2008). https://doi.org/10.1038/nphys924