Scanning tunneling spectroscopy of a semiconducting heterojunction nanotube on the Au(111) surface
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- Scanning tunneling spectroscopy of a semiconducting heterojunction nanotube on the Au(111) surface
- Kim, Hajin; Lee, J; Lee, S; Song, YJ; Choi, BY; Kuk, Y; Kahng, SJ
- Carbon nanotube; Scanning tunneling microscope
- Issue Date
- ELSEVIER SCIENCE BV
- SURFACE SCIENCE, v.581, no.2-3, pp.241 - 245
- The atomic and electronic structures of a single-wall carbon nanotube prepared on the Au(1 1 1) surface was studied. We performed scanning tunneling spectroscopy measurement in a semiconducting nanotube heterojunction, obtaining the local electronic density of states. An interface state was observed within the energy gaps of the semiconducting nanotubes. The interface state is spatially localized within a few nm scales and decays into the two semiconducting CNTs with unequal screening lengths. The interface state is donor-like, possibly originating from a heptagonal atomic structure. The interface state is well-understood, in analogy with that of a conventional semiconductor heterojunction.
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