Intersubband decay of 1-D exciton resonances in carbon nanotubes

Abstract

We have studied intersubband decay of E22 excitons in semiconducting carbon nanotubes experimentally and theoretically. Photoluminescence excitation line widths of semiconducting nanotubes with chiral indicess (n, m) can be mapped onto a connectivity grid with curves of constant (n-m) and (2n+m). Moreover, the global behavior of E22 linewidths is best characterized by a strong increase with energy irrespective of their (n-m) mod(3)= \pm 1 family affiliation. Solution of the Bethe-Salpeter equations shows that the E22 linewidths are dominated by phonon assisted coupling to higher momentum states of the E11 and E12 exciton bands. The calculations also suggest that the branching ratio for decay into exciton bands vs free carrier bands, respectively is about 10:1.

4 pages, 4 figures

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Cited by in corpus (5)

• Luminescence Decay and the Absorption Cross-Section of Individual Single-Walled Carbon Nanotubes
• Systematic Determination of Absolute Absorption Cross-section of Individual Carbon Nanotubes
• Spontaneous exciton dissociation in carbon nanotubes
• How does the substrate affect the Raman and excited state spectra of a carbon nanotube?
• Existence of an upper limit on the density of excitons in carbon nanotubes by diffusion-limited exciton-exciton annihilation: Experiment and theory