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Temperature dependent band gap behavior and excitons in metallic carbon nanotubes
Author(s) -
May Patrick,
Telg Hagen,
Thomsen Christian,
Maultzsch Janina
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000622
Subject(s) - carbon nanotube , exciton , materials science , optical properties of carbon nanotubes , condensed matter physics , band gap , raman spectroscopy , semiconductor , metal , electronic band structure , nanotube , nanotechnology , optoelectronics , physics , optics , metallurgy
Resonant 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.First optical transition $E_{11}^{{\rm M}} $ of metallic nanotubes and sketch of a metallic (13,1) tube.