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Molecular Physics seminar

Ultrafast Dynamics in a Silicon Sample Studied with RIXS and XES - from Temperature to Intense Optical or X-ray Laser Excitation

by Dr Martin Beye (Helmholtz-Zentrum Berlin)

FA31 ()


In this talk, I will give an overview about solid-state dynamical processes that have been exemplary analyzed in a silicon sample. Beginning with temperature dependent studies of the electron-phonon coupling, where the selectivity of RIXS and XES allows us to analyze coupling rates and renormalization energies, I will focus on studies conducted at FLASH, the free-electron laser at Hamburg. After a careful study of X-ray induced effects and the connected exotic non-equilibria, I will describe how silicon undergoes a two-step melting transition indicative for a liquid-liquid phase transition after optical pumping. An outlook is given, where ideas to follow a similar experimental route to analyze the nature of water are presented.