Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.197401
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Funding
- UK Engineering and Physical Sciences Research Council [EP/C010531/1, EP/C010558/1]
- EPSRC [EP/H026622/1, EP/C010531/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/C010531/1, EP/H026622/1] Funding Source: researchfish
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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 similar to 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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