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

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...

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Published inPhysical review letters Vol. 111; no. 19; p. 197401
Main Authors Allam, J, Sajjad, M T, Sutton, R, Litvinenko, K, Wang, Z, Siddique, S, Yang, Q-H, Loh, W H, Brown, T
Format Journal Article
LanguageEnglish
Published United States 06.11.2013
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Summary: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 nonequilibrium systems.
ISSN:1079-7114
DOI:10.1103/physrevlett.111.197401