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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 25
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Phys. Rev. Lett. 99, 256407 (2007) [4 pages]

Cesium-Filled Single Wall Carbon Nanotubes as Conducting Nanowires: Scanning Tunneling Spectroscopy Study

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S. H. Kim1, W. I. Choi1, G. Kim2, Y. J. Song1,†, G.-H. Jeong3,‡, R. Hatakeyama3, J. Ihm1, and Y. Kuk1,*
1Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
2BK21 Physics Research Division and Institute of Basic Science, SungKyunKwan University, Suwon 440-746, Korea
3Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan

Received 12 September 2007; published 21 December 2007

Metal-filled single wall carbon nanotubes (SWCNTs) are examined for possible application to conducting wires in nanoelectronics architecture. The local electronic structure of SWCNTs partially filled with cesium atoms is studied with scanning tunneling spectroscopy. The conduction and valence bands are shifted downward with two localized states in the gap at the location where the Cs atoms are filled. From a first-principles calculation, we confirm that these two gap states are bound states originating from the two lowest conduction bands.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.256407
DOI:
10.1103/PhysRevLett.99.256407
PACS:
71.20.Tx, 68.37.Ef, 73.20.At, 81.07.De

*Corresponding author.

ykuk@phya.snu.ac.kr

†Present address: Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

‡Present address: Department of Physics, Gothenburg University, SE 41296, Gothenburg, Sweden.

 
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