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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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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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Allam, JUNSPECIFIEDUNSPECIFIED
Sajjad, MTUNSPECIFIEDUNSPECIFIED
Sutton, RUNSPECIFIEDUNSPECIFIED
Litvinenko, KUNSPECIFIEDUNSPECIFIED
Wang, ZUNSPECIFIEDUNSPECIFIED
Siddique, SUNSPECIFIEDUNSPECIFIED
Yang, Q-HUNSPECIFIEDUNSPECIFIED
Loh, WHUNSPECIFIEDUNSPECIFIED
Brown, TUNSPECIFIEDUNSPECIFIED
Date : 16 October 2013
Identification Number : 10.1103/PhysRevLett.111.197401
Related URLs :
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
URI: http://epubs.surrey.ac.uk/id/eprint/804320

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