Photophysics in Single-Walled Carbon Nanotubes with (6,4) Chirality at High Excitation Densities: Bimolecular Auger Recombination and Phase-Space Filling of Excitons
| Autor: | Hideo Kishida, Yasumitsu Miyata, Hisanori Shinohara, Arao Nakamura, Takeshi Koyama |
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| Rok vydání: | 2013 |
| Předmět: |
Condensed Matter::Quantum Gases
Auger effect Condensed Matter::Other Chemistry Screening effect Exciton Absorption cross section Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Surfaces Coatings and Films Electronic Optical and Magnetic Materials Mott transition Condensed Matter::Materials Science symbols.namesake General Energy Ultrafast laser spectroscopy symbols Physical and Theoretical Chemistry Atomic physics Biexciton Excitation |
| Zdroj: | The Journal of Physical Chemistry C. 117:1974-1981 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp312798h |
| Popis: | The photophysics in single-walled carbon nanotubes (SWNTs) at high excitation densities has been attracting significant attention for exciton stability. Exciton–exciton interactions and an exciton Mott transition of quasi-one-dimensional excitons in SWNTs are of fundamental interest because the screening effect of the Coulomb interaction is suppressed in one-dimensional systems. In this study, we investigate exciton dynamics and a bimolecular Auger recombination process in SWNTs with (6,4) chirality using femtosecond transient absorption measurements at high excitation densities in the range of 2.4 × 1013–4.8 × 1015 photons cm–2 per pulse. Temporal evolutions of the change in the absorption coefficient are analyzed with an analytical expression for the bimolecular Auger recombination dynamics. We determine the Auger recombination coefficient and initial exciton number per tube, and the absorption cross section is also obtained. By using the phase-space filling model, the exciton size is estimated to be 3.... |
| Databáze: | OpenAIRE |
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