Single carbon nanotube photonics and the role of excitons

Libai Huang; Todd Krauss

doi:10.1117/12.679609

30 August 2006 Single carbon nanotube photonics and the role of excitons

Libai Huang, Todd Krauss

Proceedings Volume 6325, Physical Chemistry of Interfaces and Nanomaterials V; 632502 (2006) https://doi.org/10.1117/12.679609
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Many-body effects in single-walled carbon nanotubes (SWNTs) were investigated using multi-color transient absorption spectroscopy. A population of excitons in isolated SWNTs was created by resonantly exciting the lowest allowed excitonic transition. With low pump fluence, photo-induced bleaching was observed regardless of the probe energy, as expected. However, at high pump fluence, photo-induced absorption was observed when probing at a higher energy than the pump. These observations are consistent with a blue-shifted exciton absorption due to phase-space filling effects at high exciton densities. As a result of the rapid loss of excited state population through Auger recombination, the blue shift recovered with a time constant of less than 1 ps.

Citation Download Citation

Libai Huang and Todd Krauss "Single carbon nanotube photonics and the role of excitons", Proc. SPIE 6325, Physical Chemistry of Interfaces and Nanomaterials V, 632502 (30 August 2006); https://doi.org/10.1117/12.679609

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