Premium
Raman studies of electron–phonon coupling in single walled carbon nanotubes
Author(s) -
Doorn Stephen K.,
Goupalov Serguei,
Satishkumar B. C.,
Shreve Andrew P.,
Haroz Erik H.,
Bachilo Sergei M.,
Weisman R. Bruce
Publication year - 2006
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.200669155
Subject(s) - overtone , raman spectroscopy , excited state , phonon , excitation , carbon nanotube , resonance (particle physics) , molecular physics , coupling (piping) , atomic physics , electron , chemistry , condensed matter physics , materials science , physics , spectral line , nanotechnology , quantum mechanics , metallurgy
We present the results of Raman studies of the chirality dependence of electron–phonon coupling in carbon nanotubes. We demonstrate that a new parameter resulting from a tight binding derivation of the electron–phonon coupling is useful for analysing experimentally‐determined radial breathing mode (RBM) intensities. We also provide a direct comparison of RBM intensities for 6 chiralities obtained with excitation of both the E 11 and E 22 transitions. Analysis of the observed intensity trends in terms of this new parameter demonstrates that the trend to weaker intensities as one excites at resonance with higher lying transitions results from differences in excited‐state decay rates. Finally, we quantitate the magnitude of the matrix elements through modelling of RBM fundamental and overtone Raman excitation profiles using a time‐dependent Raman formalism. Results for 5 chiralities show coupling in general to be weak. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)