Excitons give unique bright colours to Armchair Nanotubes, the one-dimensional metals that have no band gap

Rice University researchers have figured out what gives armchair nanotubes their unique bright colors: hydrogen-like objects called excitons. Their findings appear in the online edition of the Journal of the American Chemical Society.

Armchair carbon nanotubes – so named for the “U”-shaped configuration of the atoms at their uncapped tips – are one-dimensional metals and have no band gap. This means electrons flow from one end to the other with little resistivity, the very property that may someday make armchair quantum wires possible.

Source: http://news.rice.edu/2012/01/09/scientists-solve-mystery-of-colorful-armchair-nanotubes-2/

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