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Excitonic absorption spectra and ultrafast dephasing dynamics in arbitrary carbon nanotubes
Author(s) -
Malic Ermin,
Hirtschulz Matthias,
Reich Stephanie,
Knorr Andreas
Publication year - 2009
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.200903125
Subject(s) - dephasing , carbon nanotube , picosecond , excitation , spectral line , molecular physics , ultrashort pulse , absorption (acoustics) , exciton , absorption spectroscopy , ab initio , coulomb , materials science , ab initio quantum chemistry methods , chemistry , chemical physics , condensed matter physics , nanotechnology , physics , optics , quantum mechanics , laser , organic chemistry , molecule , composite material , electron
We illustrate the potential of the density matrix theory for investigation of optical properties of arbitrary single‐walled carbon nanotubes (CNTs). We have performed microscopic calculations of excitonic absorption spectra for CNTs of different chiral angles and diameters. The obtained results are in good agreement with experiments, in particular the excitonic binding energies match well both experiments and ab initio calculations. Furthermore, we show the strength of our approach by presenting calculations of the ultrafast Coulomb driven non‐equilibrium dynamics in CNTs. We find excitation induced dephasing on the picosecond time scale depending on the excitation strength. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)