Aufsatz in einer Fachzeitschrift
Theory for the ultrafast ablation of graphite films
Details zur Publikation
Autor(inn)en: | Jeschke, H.; Garcia, M.; Bennemann, K. |
Verlag: | AMERICAN PHYSICAL SOC |
Publikationsjahr: | 2001 |
Zeitschrift: | Physical Review Letters |
Seitenbereich: | 1-4 |
Abkürzung der Fachzeitschrift: | PRL |
Jahrgang/Band : | 87 |
Heftnummer: | 1 |
Seitenumfang: | 4 |
ISSN: | 0031-9007 |
eISSN: | 1079-7114 |
DOI-Link der Erstveröffentlichung: |
Zusammenfassung, Abstract
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.
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.
