Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 84: Focus Session: Structural Dynamics in Nanoscale Materials Probed by Ultrashort Electron Pulses

O 84.9: Vortrag

Donnerstag, 19. März 2015, 17:45–18:00, MA 005

Radiation-induced transitions in solids — Nikita Medvedev, Zheng Li, and •Beata Ziaja — CFEL DESY, Notkestrasse 85, 22607 Hamburg

Femtosecond intense light pulses from free-electron lasers can trigger structural transitions in solids. Their theoretical description is a challenge, as it has also to include contributing non-equilibrium processes. In order to account both for thermally and nonthermally triggered transitions, we extended our recently developed hybrid model by including non-adiabatic electron-phonon coupling. In this way the heating of a material due to the electron-phonon coupling could also be treated. We show model application for laser-induced transitions in carbon and silicon. The developed scheme is general and can be used in any molecular dynamics model, also with an implementation to describe structural transitions induced by electron pulses.