Exciton energy calculations for single wall carbon nanotubes
| Autor: | Kentaro Sato, Paulo T. Araujo, G. Dresselhaus, Ado Jorio, Riichiro Saito, M. S. Dresselhaus |
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| Rok vydání: | 2009 |
| Předmět: |
Absorption spectroscopy
Condensed Matter::Other Chemistry Exciton Dielectric Carbon nanotube Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Resonance (particle physics) Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science symbols.namesake law Coulomb symbols Atomic physics Raman spectroscopy Biexciton |
| Zdroj: | physica status solidi (b). 246:2581-2585 |
| ISSN: | 0370-1972 |
| DOI: | 10.1002/pssb.200982266 |
| Popis: | Using the Bethe-Salpeter equation, we have calculated the exciton energies of (i) bright exciton states; (ii) 2g exciton energies; and (iii) the energy difference between dark and bright exciton states for single wall carbon nanotubes (SWNTs) as a function of diameter. By adjusting the dielectric constant, we can reproduce the observed exciton energies in the resonance Raman spectra and two-photon absorption spectra for SWNTs. The environmental effect on the transition energies can be explained by a diameter-dependent dielectric constant. However, the energy difference between the dark and bright exciton states cannot be reproduced simply by changing the dielectric constant consistently. Thus we need to consider the evaluation of the Coulomb interaction, especially with regard to the surrounding materials. |
| Databáze: | OpenAIRE |
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