Exciton resonances quench the photoluminescence of zigzag carbon nanotubes

Details Exciton resonances quench the photoluminescence of zigzag carbon nanotubes Exciton resonances quench the photoluminescence of zigzag carbon nanotubes

2005-04-23

arxiv.org/abs/cond-mat/0504607v1

Phys. Rev. Lett. 95, 077402 (2005)

Physics

Condensed Matter

Materials Science

4 pages and 2 supplementary pages; 6 figures

Scientific paper

10.1103/PhysRevLett.95.077402

We show that the photoluminescence intensity of single-walled carbon nanotubes is much stronger in tubes with large chiral angles - armchair tubes - because exciton resonances make the luminescence of zigzag tubes intrinsically weak. This exciton-exciton resonance depends on the electronic structure of the tubes and is found more often in nanotubes of the +1 family. Armchair tubes do not necessarily grow preferentially with present growth techniques; they just have stronger luminescence. Our analysis allows to normalize photoluminescence intensities and find the abundance of nanotube chiralities in macroscopic samples.

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