Unifying the low-temperature photoluminescence spectra of carbon nanotubes: the role of acoustic phonon confinement.

Abstract : At low temperature the photoluminescence of single-wall carbon nanotubes show a large variety of spectral profiles ranging from ultra narrow lines in suspended nanotubes to broad and asymmetrical line-shapes that puzzle the current interpretation in terms of exciton-phonon coupling. Here, we present a complete set of photoluminescence profiles in matrix embedded nanotubes including unprecedented narrow emission lines. We demonstrate that the diversity of the low-temperature luminescence profiles in nanotubes originates in tiny modifications of their low-energy acoustic phonon modes. When low energy modes are locally suppressed, a sharp photoluminescence line as narrow as 0.7 meV is restored. Furthermore, multi-peak luminescence profiles with specific temperature dependence show the presence of confined phonon modes.
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Physical Review Letters, American Physical Society, 2014, 113, pp.057402. 〈10.1103/PhysRevLett.113.057402〉
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Fabien Vialla, Yannick Chassagneux, Robson Ferreira, Cyrielle Roquelet, Carole Diederichs, et al.. Unifying the low-temperature photoluminescence spectra of carbon nanotubes: the role of acoustic phonon confinement.. Physical Review Letters, American Physical Society, 2014, 113, pp.057402. 〈10.1103/PhysRevLett.113.057402〉. 〈hal-01066160〉

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