Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena
HL 90.14: Poster
Donnerstag, 14. März 2013, 16:00–20:00, Poster A
Studying Ultrafast Quasiparticle Dynamics by Scattering of Electromagnetic Waves: Part 2 X-rays — •Marc Herzog1, André Bojahr1, Daniel Schick1, Roman Shayduk2, Hengameh Navirian2, Jevgenij Goldshteyn2, Wolfram Leitenberger1, Peter Gaal2, and Matias Bargheer1,2 — 1Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Helmholtz- Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
Materials exhibiting different types of collective physical phenomena such as metal-insulator transitions or (multi)ferroic behavior are of particular physical and technological interest. The related phase transitions are often mediated by the lattice and can in many cases be transiently triggered by ultrashort laser pulses. A thorough understanding of the ultrafast structural dynamics after laser excitation is therefore crucial for the optical control of material properties.
In general, a suitable experimental method to study ultrafast structural dynamics is the scattering of electromagnetic waves. This contribution summarizes the investigation of laser-induced coherent acoustic phonons in metal-insulator heterostructures by time-resolved scattering of hard x-rays. We use different excitation schemes and sample geometries to generate high-amplitude sub-THz quasi-monochromatic phonons in SrTiO3. We observed linear and nonlinear propagation effects which can be accurately simulated by an anharmonic linear chain model.