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Kim, Hajin
Single Molecule Biophysics Lab
Research Interests
  • Biophysics, Single Molecule, fluorescence Spectroscopy, biological Motors, biomolecular assembly

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Paired gap states in a semiconducting carbon nanotube: Deep and shallow levels

Cited 43 times inthomson ciCited 36 times inthomson ci
Title
Paired gap states in a semiconducting carbon nanotube: Deep and shallow levels
Author
Lee, SKim, GKim, HajinChoi, BYLee, JJeong, BWIhm, JKuk, YKahng, SJ
Keywords
Impurity substitution; Paired gap states; Scanning tunneling spectroscopy; Vacancy-adatom complex
Issue Date
200510
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.95, no.16, pp. -
Abstract
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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DOI
http://dx.doi.org/10.1103/PhysRevLett.95.166402
ISSN
0031-9007
Appears in Collections:
SLS_Journal Papers
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