Theory for the ultrafast ablation of graphite films

Details Theory for the ultrafast ablation of graphite films Theory for the ultrafast ablation of graphite films

2001-03-05

arxiv.org/abs/cond-mat/0103118v1

Phys. Rev. Lett. 87, 015003 (2001)

Physics

Condensed Matter

Materials Science

5 pages RevTeX, 3 PostScript figures, submitted to Phys. Rev

Scientific paper

10.1103/PhysRevLett.87.015003

The physical mechanisms for damage formation in graphite films induced by femtosecond laser pulses are analyzed using a microscopic electronic theory. We describe the nonequilibrium dynamics of electrons and lattice by performing molecular dynamics simulations on time-dependent potential energy surfaces. We show that graphite has the unique property of exhibiting two distinct laser induced structural instabilities. For high absorbed energies (> 3.3 eV/atom) we find nonequilibrium melting followed by fast evaporation. For low intensities above the damage threshold (> 2.0 eV/atom) ablation occurs via removal of intact graphite sheets.

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