[en] We present a Raman study of the collective vibrations arising from the homogeneous bundling of single-walled carbon nanotubes and analyze the dependence of their vibrational coupling on the tube diameter using two systems, single-walled carbon nanotube coils and a monochiral carbon nanotube film. We report on two breathing-like modes for quasi-infinite bundles, compared to the single radial breathing mode characteristic for isolated tubes. The exciton-phonon coupling in these modes is probed with resonant Raman spectroscopy, revealing the same resonance energy for both breathing-like peaks. Our experimental findings align well with previously reported theoretical studies, demonstrating a 1/d scaling for all modes, as well as confirming the relative shift of the modes dependent on intertube interaction. These vibrations provide insight into the role of intertube lattice dynamics in two-dimensional THz-range phononic crystals.
Disciplines :
Physique
Auteur, co-auteur :
Berrezueta-Palacios, Charlotte ; Department of Physics, Freie Universität Berlin, Berlin, Germany
Nakar, Dekel ; Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel
Wroblewska, Anna ; Faculty of Physics, Warsaw University of Technology, Warsaw, Poland
Garrity, Oisín ; Department of Physics, Freie Universität Berlin, Berlin, Germany
Li, Han; Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany ; Department of Mechanical and Materials Engineering, University of Turku, Turku, Finland
Shadmi, Nitzan; Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel
Flavel, Benjamin S.; Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany
Joselevich, Ernesto; Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel
Reich, Stephanie; Department of Physics, Freie Universität Berlin, Berlin, Germany
GORDEEV, Georgy ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; Department of Physics, Freie Universität Berlin, Berlin, Germany
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
Collective radial breathing modes in homogeneous nanotube bundles
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