Photoluminescence clamping with few excitons in a single-walled carbon nanotube

Details Photoluminescence clamping with few excitons in a single-walled carbon nanotube Photoluminescence clamping with few excitons in a single-walled carbon nanotube

2009-04-20

arxiv.org/abs/0904.3049v1

Phys. Rev. Lett. 104, 017401 (2010) [4 pages]

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.104.017401

Single air-suspended carbon nanotubes (length 2 - 5 microns) exhibit high optical quantum efficiency (7 - 20%) for resonant pumping at low intensities. Under ultrafast excitation, the photoluminescence dramatically saturates for very low injected exciton numbers (2 to 6 excitons per pulse per SWCNT). This PL clamping is attributed to highly efficient exciton-exciton annihilation over micron length scales. Stochastic modeling of exciton dynamics and femtosecond excitation correlation spectroscopy allow determination of nanotube absorption (2 - 6%) and exciton lifetime (85 +- 20 ps).

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