Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Structural Dynamics in Nanoscale Materials Probed by Ultrashort Electron Pulses

O 70.4: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Laser-induced ultrafast phenomena in Ge — •Tobias Zier, Eeuwe S. Zijlstra, and Martin E. Garcia — University of Kassel, Germany

The extreme non-equilibrium state in a solid induced by an intense femtosecond laser pulse excitation, in which the electrons have a temperature of several 10 000 K and the atoms remain nearly unaffected, allows to access pathways that are not accessible in thermodynamic equilibrium and therefore gives rise to interesting effects. Prominent phenomena are thermal phonon squeezing, nonthermal melting and solid-to-solid phase transitions. We performed ab initio Molecular-Dynamics simulations of laser-excited germanium in order to study the structural response of this semiconducting material as a function of the fluence and compared our results to recent experimental findings [1].

[1] Trigo, M et al., Nature Phys. 9, 790 (2013)