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Independence of Optical Absorption on Auger Ionization in Single-Walled Carbon Nanotubes Revealed by Ultrafast e-h Photodoping

Auger-ionized carriers in a one-dimensional semiconductor are predicted to result in a strong band-gap renormalization. Isolated single-walled carbon nanotubes (SWCNT) under high-intensity laser irradiation exhibit strong nonlinear photoluminescence (PL) due to exciton-exciton annihilation (EEA). The presence of exciton disassociation during the rapid Auger-ionization caused by EEA would lead to a strong nonlinear absorption. By simultaneously measuring SWCNT PL and optical absorption of isolated SWCNT clusters in the PL saturation regime, we give evidence that Auger-ionized excitons do not disassociate but remain bound.

preprint2015arXivOpen access
Mitchell D. AndersonMeghan N. BeattieJack A. Alexander-WebberRobin J. NicholasJames M. Fraser
cond-mat.mes-hall
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Mitchell D. AndersonMeghan N. BeattieJack A. Alexander-WebberRobin J. NicholasJames M. Fraser

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