Author: ["A. Gambetta","C. Manzoni","E. Menna","M. Meneghetti","G. Cerullo","G. Lanzani","S. Tretiak","A. Piryatinski","A. Saxena","R. L. Martin","A. R. Bishop"]
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Abstract
Single-walled carbon nanotubes (SWNTs) are π-conjugated, quasi-one-dimensional structures consisting of rolled-up graphene sheets that, depending on their chirality, behave as semiconductors or metals1; owing to their unique properties, they enable groundbreaking applications in mechanics, nanoelectronics and photonics2,3. In semiconducting SWNTs, medium-sized excitons (3–5 nm) with large binding energy and oscillator strength are the fundamental excitations4,5,6,7,8; exciton wavefunction localization and one-dimensionality give rise to a strong electron–phonon coupling9,10,11, the study of which is crucial for the understanding of their electronic and optical properties. Here we report on the use of resonant sub-10-fs visible pulses12 to generate and detect, in the time domain, coherent phonons in SWNT ensembles. We observe vibrational wavepackets for the radial breathing mode (RBM) and the G mode, and in particular their anharmonic coupling, resulting in a frequency modulation of the G mode by the RBM. Quantum-chemical modelling13 shows that this effect is due to a corrugation of the SWNT surface on photoexcitation, leading to a coupling between longitudinal and radial vibrations.Cite this article
Gambetta, A., Manzoni, C., Menna, E. et al. Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes. Nature Phys 2, 515–520 (2006). https://doi.org/10.1038/nphys345 