Chiral vector determination of carbon nanotubes by observation of interference patterns near the end cap |
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Authors: | Furuhashi Masayuki Komeda Tadahiro |
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Affiliation: | IMRAM, Tohoku University, 2-1-1, Katahira, Aoba, Sendai 980-0877, Japan. |
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Abstract: | We have observed clear interference images near the end caps of semiconducting carbon nanotubes with quasiarmchair and zigzag chiral vectors, using a scanning tunneling microscope. We performed a simple tight-binding calculation to simulate the interference patterns, in which Bloch states with k and -k wave vectors were superimposed. The calculations were able to reproduce the observed interference patterns. In addition, we demonstrated that the interference patterns can be categorized by the positions of k_{min} in the Brillouin zone that yield minimum energy in the conduction band, and can give information on the chiral vector of a carbon nanotube. |
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