Theory for laser-induced ultrafast phase transitions in carbon

Harald Olaf Jeschke, M. E. Garcia, K. H. Bennemann

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The response of carbon to femtosecond laser pulses of arbitrary form, different durations, and different intensities is studied theoretically. We perform molecular dynamics simulations based on a microscopic electronic Hamiltonian. We include in our model the theoretical description of the pulse form, the electron thermalization, and diffusion effects explicitly. We apply our method to diamond and C60 crystals. For the diamond case, we show that a femtosecond laser pulse induces a nonequilibrium transition to graphite, which takes place for a wide range of pulse durations and intensities. This ultrafast collective motion of the atoms occurs within a time scale shorter than 100 fs. The laser-induced melting of a C60 crystal under pressure is also analyzed. In this case, an ultrafast melting of the system occurs. We discuss the mechanisms underlying these nonequilibrium phase transitions.

Original languageEnglish
Pages (from-to)S49-S53
JournalApplied Physics A: Materials Science and Processing
Volume69
Issue number7
DOIs
Publication statusPublished - Dec 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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