Berlin 2024 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 16: Poster Ia

MM 16.1: Poster

Montag, 18. März 2024, 18:30–20:30, Poster E

Investigation of excitation-induced non-thermal effects in semiconductors, metals and alloys — •Simon Kümmel and Johannes Roth — FMQ, Universität Stuttgart, Germany

Excitation-induced non-thermal melting in silicon, as well as bondhardening in gold following strong laser irradiation with short pulse durations have been known for several years. Furthermore, several traces of excitation-induced solid-solid phase transitions have been noticed in a variety of materials.

Here, we present several approaches to identify and quantify excitationinduced effects changing the bond strength and inducing phase transitions systematically in several semiconductors, metals and alloys obtained from DFT calculations depending on the degree of excitation. These calculation are in line with previous investigations and provide new insights into the change of the bond strength and the induced phase transitions following strong laser excitation.

Keywords: DFT; Laser; Excitation; Phase transition; non-thermal