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VOLUME 78, NUMBER 14 P H Y S I C A L R E V I E W L E T T E R S 7 APRIL 1997 Electronic Structure and Localized States at Carbon Nanotube Tips
 

Summary: VOLUME 78, NUMBER 14 P H Y S I C A L R E V I E W L E T T E R S 7 APRIL 1997
Electronic Structure and Localized States at Carbon Nanotube Tips
D. L. Carroll,* P. Redlich, and P. M. Ajayan
Max-Planck-Institut für Metallforschung, Seestraße 92, 70174 Stuttgart, Germany
J. C. Charlier,
X. Blase,§
A. De Vita, and R. Car
Institut Romand de Recherche Numerique en Physique des Materiaux IN-Ecublens, CH-1015 Lausanne, Switzerland
(Received 12 August 1996; revised manuscript received 25 November 1996)
Topology related changes in the local density of states near the ends of closed carbon nanotubes
are investigated using spatially resolved scanning tunneling spectroscopy and tight binding calculations.
Sharp resonant valence band states are observed in the experiment at the tube ends, dominating the
valence band edge and filling the band gap. Calculations show that the strength and position of these
states with respect to the Fermi level depend sensitively on the relative positions of pentagons and their
degree of confinement at the tube ends. [S0031-9007(97)02881-0]
PACS numbers: 73.20.Dx, 61.16.Ch, 61.48.+c
Carbon nanotubes constitute the link between large car-
bon fibers used as mechanical reinforcements in compos-
ites and molecular wires that could lead to ideal electrical
connectors in future technology [1]. Two general cate-

  

Source: Ajayan, Pulickel M. - Department of Mechanical Engineering and Materials Science, Rice University

 

Collections: Materials Science