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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Quantized bimolecular auger recombination of excitons in single-walled carbon nanotubes
1Department of Chemistry, University of Rochester, Rochester, New York 14267, USA.
Abstract:
Auger-like exciton-exciton annihilation in isolated single-walled carbon nanotubes (SWNTs) has been studied by femtosecond transient absorption spectroscopy. We observe a quantization of the Auger recombination process and extract dynamics for 2 and 3 electron-hole pair excited states. We further demonstrate that Auger recombination in SWNTs is a two-particle process involving strongly bound excitons and not a three-particle Auger process involving unbound electrons and holes. We thus provide explicit experimental evidence for one-dimensional discrete excitons in SWNTs.
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