Radiative Lifetime of Excitons in Carbon Nanotubes
Top Cited Papers
- 15 November 2005
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (12) , 2495-2499
- https://doi.org/10.1021/nl051828s
Abstract
We calculate the radiative lifetime and energy bandstructure of excitons in semiconducting carbon nanotubes within a tight-binding approach including the electron-hole correlations via the Bethe-Salpeter equation. In the limit of rapid interband thermalization, the radiative decay rate is maximized at intermediate temperatures and decreases at low temperature because the lowest-energy excitons are optically forbidden. The intrinsic phonons cannot scatter excitons between optically active and forbidden bands, so sample-dependent extrinsic effects that break the symmetries can play a central role. We calculate the diameter-dependent energy splittings between singlet and triplet excitons of different symmetries and the resulting dependence of radiative lifetime on temperature and tube diameter.Keywords
All Related Versions
This publication has 36 references indexed in Scilit:
- Structural Dependence of Excitonic Optical Transitions and Band-Gap Energies in Carbon NanotubesNano Letters, 2005
- Quantum Dephasing in Carbon Nanotubes due to Electron-Phonon CouplingPhysical Review Letters, 2005
- The Optical Resonances in Carbon Nanotubes Arise from ExcitonsScience, 2005
- Photoconductivity Spectra of Single-Carbon Nanotubes: Implications on the Nature of Their Excited StatesNano Letters, 2005
- Electron-Phonon Interaction and Transport in Semiconducting Carbon NanotubesPhysical Review Letters, 2005
- Excited-state carrier lifetime in single-walled carbon nanotubesPhysical Review B, 2005
- Electron Interactions and Scaling Relations for Optical Excitations in Carbon NanotubesPhysical Review Letters, 2004
- Ultrafast Spectroscopy of Excitons in Single-Walled Carbon NanotubesPhysical Review Letters, 2004
- Structure-Assigned Optical Spectra of Single-Walled Carbon NanotubesScience, 2002
- Band Gap Fluorescence from Individual Single-Walled Carbon NanotubesScience, 2002