Ab initio study of vibrational dephasing of electronic excitations in semiconducting carbon nanotubes
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Published on: January 19, 2018
Bradley F Habenicht1, Hideyuki Kamisaka, Koichi Yamashita
1Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
Abstract:
Phonon-induced dephasing of electronic transitions in semiconducting single-wall carbon nanotubes (CNT) is investigated by ab initio molecular dynamics. Pure-dephasing is shown to be the source of the photoluminescence linewidths observed experimentally in isolated CNTs at low and room temperatures. In ideal tubes, the dephasing is found to occur by coupling to optical phonons. The dephasing proceeds notably faster in the presence of some defects due to stronger coupling to local modes, suggesting that the defects can be identified in CNTs by broadened optical bands.
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