A series of nondegenerate pump-probe measurements were carried out on a DNA-wrapped single-walled carbon nanotube (SWNT) sample that is enriched with the (6,5) species. The pump pulse excites SWNTs at ∼1.567eV, which corresponds to an energy of two D-band phonons above the excitonic band edge of the (6,5) SWNT. The dynamics of different channels of exciton relaxation for the (6,5) SWNT is analyzed in terms of the decay in the time-resolved differential transmission spectra. By systematically varying the values of the probe energy, Eprobe, to be in and out of resonance with the minority (n,m) SWNT species in the sample at different pump fluence levels, an intermediate decay component associated with a hot phonon-absorption process is studied in detail. When the values of Eprobe were further tuned to off-resonance positions, photo-induced absorption processes could be investigated.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2005 Nov 15|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics