Paired gap states in a semiconducting carbon nanotube: Deep and shallow levels
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- Paired gap states in a semiconducting carbon nanotube: Deep and shallow levels
- Lee, S; Kim, G; Kim, Hajin; Choi, BY; Lee, J; Jeong, BW; Ihm, J; Kuk, Y; Kahng, SJ
- Impurity substitution; Paired gap states; Scanning tunneling spectroscopy; Vacancy-adatom complex
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.95, no.16, pp. -
- Several paired, localized gap states were observed in semiconducting single-wall carbon nanotubes using spatially resolved scanning tunneling spectroscopy. A pair of gap states is found far from the band edges, forming deep levels, while the other pair is located near the band edges, forming shallow levels. With the help of a first-principles study, the former is explained by a vacancy-adatom complex while the latter is explained by a pentagon-heptagon structure. Our experimental observation indicates that the presence of the gap states provides a means to perform local band-gap engineering as well as doping without impurity substitution.
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