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

Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption
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 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.
1-5
Allam, J.
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Sajjad, M.T.
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Sutton, R.
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Litvinenko, K.
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Wang, Zilong
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Siddique, S.
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Yang, Q.-H.
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Loh, Wei H.
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Brown, T.
a64aae36-bb30-42df-88a2-11be394e8c89
Allam, J.
53cb4beb-2055-4aea-b477-a47b126e6d1e
Sajjad, M.T.
b24d39ab-3923-43a0-9b1f-f0cce4ca3e37
Sutton, R.
0cb48b6b-30f8-42a9-849d-4c5a3c8dcc0c
Litvinenko, K.
17fc718f-395a-4bc8-930a-8f8556eea836
Wang, Zilong
4f6f5b53-bbc7-4f1f-9803-fbec5b88dc29
Siddique, S.
28862fde-c308-4d07-b541-fb6667220382
Yang, Q.-H.
237b6e73-cf0f-446e-9457-de29ed2cf6ae
Loh, Wei H.
2b7c57fe-000d-4405-a529-810597317ea8
Brown, T.
a64aae36-bb30-42df-88a2-11be394e8c89

Allam, J., Sajjad, M.T., Sutton, R., Litvinenko, K., Wang, Zilong, Siddique, S., Yang, Q.-H., Loh, Wei H. and Brown, T. (2013) Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption. Physical Review Letters, 111 (19), 1-5. (doi:10.1103/PhysRevLett.111.197401). (PMID:24266488)

Record type: Article

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 nonequilibrium systems.

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PhysRevLett.111.197401 - Version of Record
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Published date: 6 November 2013
Organisations: Optoelectronics Research Centre, Chemistry

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Local EPrints ID: 369434
URI: https://eprints.soton.ac.uk/id/eprint/369434
PURE UUID: 9f58633b-d0f3-4d44-bfad-afd5ebff40a1

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Date deposited: 26 Sep 2014 11:32
Last modified: 23 Oct 2017 16:33

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Contributors

Author: J. Allam
Author: M.T. Sajjad
Author: R. Sutton
Author: K. Litvinenko
Author: Zilong Wang
Author: S. Siddique
Author: Q.-H. Yang
Author: Wei H. Loh
Author: T. Brown

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