Theory for the ultrafast ablation of graphite films

被引：155

作者：

Jeschke, HO ^{[1
]}

Garcia, ME ^{[1
]}

Bennemann, KH ^{[1
]}

机构：

[1] Free Univ Berlin, Inst Theoret Phys, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.87.015003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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