Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption

Abstract

Exciton-exciton recombination in isolated semiconducting single-walled carbon nanotubes was studied using femtosecond transient absorption. Under sufficient excitation to saturate the optical absorption, we observed an abrupt transition between reaction- and diffusion- limited kinetics, arising from reactions between incoherent localized excitons with a finite probability of ~ 0.2 per encounter. This represents the first experimental observation of a crossover between classical and critical kinetics in a 1D coalescing random walk, which is a paradigm for the study of non- equilibrium systems.

Accepted for Physical Review Letters. Title changed, and "exciton fusion" replaced by "exciton-exciton recombination". Present address of Prof Tom Brown added. 12 pages plus 3 figures

References in corpus (1)

• Stepwise Quenching of Exciton Fluorescence in Carbon Nanotubes by Single Molecule Reactions

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