Breathing coherent phonons and caps fragmentation in carbon nanotubes following ultrafast laser pulses

Traian Dumitricǎ, Martin E. Garcia, Harald Olaf Jeschke, Boris I. Yakobson

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The response of carbon nanotubes to femtosecond laser pulses is studied with a nonadiabatic simulation technique, which accounts for the evolution of electronic and ionic degrees of freedom, and for the coupling with the external electromagnetic field. As a direct result of electronic excitation, three coherent breathing phonon modes are excited: two radial vibrations localized in the caps and cylindrical body, and one longitudinal vibration coupled to the nanotube length. Under high absorbed energies (but below 2.9 eV /atom, the graphite's ultrafast fragmentation threshold), the resulting oscillatory motion leads to the opening of nanotube caps. Following the cap photofragmentation the nanotube body remains intact for the rest of the 2 ps simulation time.

Original languageEnglish
Article number193406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number19
DOIs
Publication statusPublished - Nov 15 2006
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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