Coherent phonons in carbon based nanostructures

G. D. Sanders, A. R.T. Nugraha, K. Sato, J. H. Kim, Y. S. Lim, J. Kono, R. Saito, C. J. Stanton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have developed a theory for the generation and detection of coherent phonons in carbon based nanotstructures such as single walled nanotubes (SWNTs), graphene, and graphene nanoribbons. Coherent phonons are generated via the deformation potential electron/hole-phonon interaction with ultrafast photo-excited carriers. They modulate the reflectance or absorption of an optical probe pules on a THz time scale and might be useful for optical modulators. In our theory the electronic states are treated in a third nearest neighbor extended tight binding formalism which gives a good description of the states over the entire Brillouin zone while the phonon states are treated using valence force field models which include bond stretching, in-plane and out-of-plane bond bending, and bond twisting interactions up to fourth neighbor distances. We compare our theory to experiments for the low frequency radial breathing mode (RBM) in micelle suspended single-walled nanotubes (SWNTs). The analysis of such data provides a wealth of information on the dynamics and interplay of photons, phonons and electrons in these carbon based nanostructures.

Original languageEnglish
Title of host publicationMicro- and Nanotechnology Sensors, Systems, and Applications VI
PublisherSPIE
ISBN (Print)9781628410204
DOIs
Publication statusPublished - 2014
EventMicro- and Nanotechnology Sensors, Systems, and Applications VI - Baltimore, MD, United States
Duration: 2014 May 52014 May 9

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9083
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherMicro- and Nanotechnology Sensors, Systems, and Applications VI
CountryUnited States
CityBaltimore, MD
Period14/5/514/5/9

Keywords

  • Carbon nanotubes
  • Coherent phonons
  • Excitonic effects
  • Radial breathing modes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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