Abstract
We 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 21 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.
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