Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.21: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Collective Radial Breathing Modes in Homogeneous Nanotube Bundles — •Charlotte Berrezueta-Palacios¹, Dekel Nakar², Anna Wroblewska³, Oisín Garrity¹, Han Li^4,5, Nitzan Shadmi², Benjamin S. Flavel⁴, Ernesto Joselevich², Stephanie Reich¹, and Georgy Gordeev^1,6 — ¹Department of Physics, Freie Universität Berlin, Germany. — ²Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Israel — ³Faculty of Physics, Warsaw University of Technology, Poland — ⁴Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany. — ⁵Department of Mechanical and Materials Engineering, University of Turku, Finland — ⁶Department of Physics and Materials Science, University of Luxembourg, Luxembourg.

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 CNT film. We report on two breathing-like modes for quasi-infinite bundles, compared to the single radial breathing mode characteristic of 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.

Keywords: Collective vibrational modes; Carbon nanotube bundle; Radial breathing modes; Nanotube bundles