http://www.cnr.it/ontology/cnr/individuo/prodotto/ID178408

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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A. Gambetta, C. Manzoni, E. Menna, M. Meneghetti, G. Cerullo, G. Lanzani, S. Tretiak, A. Piryatinski, A. Saxena, R.L. Martin, A.R. Bishop (2006)
Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes
in Nature physics (Print); NATURE PUBLISHING GROUP,, LONDON (Regno Unito)
(literal)

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A. Gambetta, C. Manzoni, E. Menna, M. Meneghetti, G. Cerullo, G. Lanzani, S. Tretiak, A. Piryatinski, A. Saxena, R.L. Martin, A.R. Bishop (literal)

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Dipartimento di Fisica - National Laboratory for Ultrafast and Ultraintense Optical Science; Department of Chemical Sciences - University of Padova; Theoretical Division - Center for Nonlinear Studies (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 made up of enrolled graphene sheets that, depending on their chirality, behave as semiconductors or metals; owing to their unique properties, they enable groundbreaking applications in mechanics, nanoelectronics and photonics,. In semiconducting SWNTs, medium-sized excitons (3-5 nm) with large binding energy and oscillator strength are the fundamental excitation-; exciton wavefunction localization and one-dimensionality give rise to a strong electron-phonon coupling-, 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 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 chemicalmodelling 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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