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First and second optical transitions in single‐walled carbon nanotubes: a resonant Raman study
Author(s) -
Telg H.,
Maultzsch J.,
Reich S.,
Thomsen C.
Publication year - 2007
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.200776141
Subject(s) - raman spectroscopy , laser linewidth , carbon nanotube , phonon , matrix element , exciton , resonance (particle physics) , coupling (piping) , atomic physics , materials science , excitation , molecular physics , condensed matter physics , chemistry , laser , physics , nanotechnology , optics , particle physics , quantum mechanics , metallurgy
Resonant Raman spectroscopy was performed to study electron–phonon coupling in single‐walled carbon nanotubes separated in solution. By varying the excitation energy from 1.26 eV to 1.93 eV we obtained radial breathing mode resonance profiles of the first and second optical transitions E 11 and E 22 of the (9,1) and (8,3) tubes. We observe up to 16 times stronger Raman intensities for the E 11 transitions which can mostly be attributed to a two times broader linewidth of the E 22 transition. Comparison of the matrix element ratio ℳ 11 /ℳ 22 to theoretical predictions on the electron–phonon coupling show a deviation of a factor 1.7 which might be associated with the change of the exciton–photon matrix element. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)