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MM: Fachverband Metall- und Materialphysik

MM 47: Poster Session II

MM 47.10: Poster

Mittwoch, 14. März 2018, 18:30–19:45, Poster C

Control of (in)coherent dynamics in phononic superlattices — •Dennis Meyer, Daniel Metternich, Roland Potthast, and Henning Ulrichs — I. Physikalisches Institut, Georg-August-Universität Göttingen

We present methods to control (in)coherent phonon dynamics in multilayer films by tailoring the elastic band structure or exploiting external manipulation of material properties. On the experimental side we show how a wedge-shaped metallic thin film of tungsten, together with a pump-probe technique can be used as an on-sample spectrometer for probing phonon band gaps. Measurements on samples of insulating multilayers, manganites and block copolymers are accompanied by a theoretical model which is implemented as a finite differences time-domain simulation. Besides applying this method, a link between the phonon spectrum and thermal transport will be drawn by transient thermoreflectance measurements. We acknowledge financial support by the DFG within the CRC 1073 Atomic scale control of energy conversion.