Researchers have observed light propagation in which photons glide smoothly along a one-dimensional chain of electrons known as a Luttinger liquid — a many-body interacting quantum system held within a single-walled carbon nanotube.
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Tame, M. Liquid quantum photonics. Nature Photon 9, 485–487 (2015). https://doi.org/10.1038/nphoton.2015.130