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). Th...

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Bibliographic Details
Published in:arXiv.org 2015-08
Main Authors: Anderson, Mitchell D, Beattie, Meghan N, Alexander-Webber, Jack A, Nicholas, Robin J, Fraser, James M
Format: Article
Language:English
Subjects:
Absorption
Augers
Excitons
High power lasers
Ionization
Nanotubes
Photoluminescence
Single wall carbon nanotubes
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1508.04004