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Spectroscopic characterization of Stone-Wales defects in nanotubes

AuthorsMiyamoto, Yoshiyuki; Rubio, Angel ; Berber, Savas; Yoon, Mina; Tománek, David
Issue DateMar-2004
PublisherAmerican Physical Society
CitationPhysical Review B 69: 121413(R) (2004)
AbstractWe combined resonant photoabsorption and vibration spectroscopy with scanning tunneling microscopy (STM) to unambiguously identify the presence of Stone-Wales (SW) defects in carbon and boron nitride nanotubes. Based on extensive time-dependent ab initio density functional calculations, we propose to resonantly photoexcite SW defects in the infrared and ultraviolet regime as a means of their identification. Onset of nonradiative decay to a local defect vibration with a frequency of 1962 cm-1 serves as a fingerprint of such defects in carbon nanotubes. The bias dependence of the STM images shows distinct features associated with the presence of SW defects.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.69.121413
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