Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption
Allam, J, Sajjad, MT, Sutton, R, Litvinenko, K, Wang, Z, Siddique, S, Yang, Q-H, Loh, WH and Brown, T (2013) Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption Physical Review Letters.
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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.
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Date :||16 October 2013|
|Identification Number :||https://doi.org/10.1103/PhysRevLett.111.197401|
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|Additional Information :||Copyright 2013 The American Physical Society. This is the author's version of a paper accepted for publication in Physical Review Letters|
|Depositing User :||Symplectic Elements|
|Date Deposited :||29 Oct 2013 10:29|
|Last Modified :||09 Jun 2014 13:44|
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