Single doped defects in carbon nanotubes locally modify the energies of charge carriers and lattice vibrations. They can now be detected by inelastic light-scattering experiments.
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Freitag, M. Doped defects tracked down. Nature Mater 7, 840–841 (2008). https://doi.org/10.1038/nmat2308
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DOI: https://doi.org/10.1038/nmat2308
