Journal article
Theory for laser-induced ultrafast phase transitions in carbon



Publication Details
Authors:
Jeschke, H.; Garcia, M.; Bennemann, K.
Publisher:
SPRINGER VERLAG
Publication year:
1999
Journal:
Applied Physics A: Materials Science and Processing
Pages range:
S49-S53
Volume number:
69
Start page:
S49
End page:
S53
Number of pages:
5
ISSN:
0947-8396

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 C-60 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 C-60 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.


Authors/Editors

Last updated on 2019-12-03 at 22:02