Abstract
We investigate exciton dynamics in isopycnically enriched (6,5)
nanotube-DNA suspensions using femtosecond time-resolved pump-probe
spectroscopy. The ground state recovery is characterized by a t(-0.45)
+/- (0.03) power law behavior, indicative of a one-dimensional
diffusion-limited reaction that is tentatively attributed to
subdiffusive trapping of dark excitons. Spectral transients of bright
(,40 singlet excitons within the Ell and E-22 manifolds exhibit a
photobleach (PB) and a photoabsorption (PA) signal of similar strength.
The PA is blue-shifted with respect to the PB-signal by 7.5 meV and is
attributed to a transition from the dark singlet exciton (0)A(0) + to a
(0)A(0)(-) + (0)A(0)(+) state within the two exciton E-11 manifold.
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