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Exciton dynamics probed in carbon nanotube suspensions with narrow diameter distribution
Author(s) -
Hertel Tobias,
Zhu Zipeng,
Crochet Jared,
McPheeters Claiborne,
Ulbricht Hendrik,
Resasco Daniel
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.200669197
Subject(s) - photobleaching , carbon nanotube , excitation , exciton , superposition principle , wavelength , relaxation (psychology) , molecular physics , chirality (physics) , nanotube , dynamics (music) , materials science , dipole , atomic physics , chemistry , fluorescence , optics , physics , optoelectronics , nanotechnology , condensed matter physics , psychology , social psychology , chiral symmetry breaking , organic chemistry , quantum mechanics , quark , acoustics , nambu–jona lasinio model
Abstract We report on a pump–probe study of CoMoCAT nanotube suspensions with narrow chirality distribution. Visible pump pulses and a white light continuum are used for resonant excitation of the strongest dipole allowed E 22 subband exciton in the semiconducting (6, 5) tube and for broadband probe of the resulting spectral transients between 1300 nm and 480 nm, respectively. Transient spectra show signatures of both photobleaching (PB) and photoabsorption (PA) with practically identical decay‐ but slightly different rise‐times. The experiments reveal that apparent variations of decay rates at different wavelengths do not reflect dynamics of different relaxation processes but are a consequence of the superposition of PB and blue‐shifted PA response. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)