Abstract
AbstractResonant Raman spectroscopy is used to investigate the temperature dependence of the optical transitions of metallic and semiconducting nanotubes. While the semiconducting nanotubes show an approximately linear temperature dependence as known for bulk semiconductors, the metallic nanotubes show a different temperature dependent behavior with a non‐monotonic dependence of the transition energy on the temperature. This result can be attributed to dissociation of bound electron–hole pairs (excitons), leading to a quasi band‐to‐band transition.magnified image First optical transition $E_{11}^{{\rm M}} $ of metallic nanotubes and sketch of a metallic (13,1) tube.
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