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Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes (Articolo in rivista)

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Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes (Articolo in rivista) (literal)

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Gambetta, A; Manzoni, C; Menna, E; Meneghetti, M; Cerullo, G; Lanzani, G; Tretiak, S; Piryatinski, A; Saxena, A; Martin, RL; Bishop, AR (2006)
Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes
in Nature physics (Print)
(literal)

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Gambetta, A; Manzoni, C; Menna, E; Meneghetti, M; Cerullo, G; Lanzani, G; Tretiak, S; Piryatinski, A; Saxena, A; Martin, RL; Bishop, AR (literal)

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Politecn Milan, Dipartimento Fis, Natl Lab Ultrafast & Ultraintense Opt Sci, CNR INFM, I-20133 Milan, Italy; Univ Padua, Dept Chem Sci, I-35131 Padua, Italy; Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA; Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA (literal)

Titolo

Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes (literal)

Abstract

Single-walled carbon nanotubes (SWNTs) are pi-conjugated, quasi-one-dimensional structures consisting of rolled-up graphene sheets that, depending on their chirality, behave as semiconductors or metals(1); owing to their unique properties, they enable groundbreaking applications in mechanics, nanoelectronics and photonics(2,3). In semiconducting SWNTs, medium-sized excitons (3-5 nm) with large binding energy and oscillator strength are the fundamental excitations(4-8); exciton wavefunction localization and one-dimensionality give rise to a strong electron-phonon coupling(9-11), 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 pulses(12) 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 modelling(13) shows that this effect is due to a corrugation of the SWNT surface on photoexcitation, leading to a coupling between longitudinal and radial vibrations. (literal)

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