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Phys. Rev. B 58, R13314–R13317 (1998)

Effect of intertube coupling on the electronic structure of carbon nanotube ropes

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Young-Kyun Kwon
Department of Physics and Astronomy, and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824-1116

Susumu Saito
Department of Physics, Tokyo Institute of Technology, 1-12-1 Oh-okayama, Meguro-ku, Tokyo 152, Japan

David Tománek
Department of Physics and Astronomy, and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824-1116

Received 20 April 1998; published in the issue dated 15 November 1998

We calculate the structural and electronic properties of an ordered “bundle” of (10,10) carbon nanotubes. Our results indicate that intertube coupling causes an additional band dispersion of ≲0.2 eV and opens up a pseudogap of the same magnitude at EF. Soft librations at ν≈12 cm-1 are predicted to occur below the orientational melting temperature which marks the onset of tube rotations about their axis. Whereas the density of states near EF increases by 7% due to intertube coupling and by one order of magnitude due to K doping in KC8, these states do not couple to tube librations.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.R13314
DOI:
10.1103/PhysRevB.58.R13314
PACS:
61.48.+c, 61.50.Ah, 73.61.Wp, 81.10.Aj
 
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