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Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.15: Poster

Tuesday, April 2, 2019, 17:00–20:00, Poster E

Ultrafast energy transport in nanoscopic metal-insulator multilayers - Electrons vs. phonons — •Marc Herzog1, Jan-Etienne Pudell1, Alexander von Reppert1, Alexei Maznev2, Matthias Kronseder3, Christian Back3,4, Gregory Malinowski5, and Matias bargheer61Institut für Physik und Astronomie, Universität Potsdam — 2Dept. of Chemistry, MIT — 3Institut für Experimentelle und Angewandte Physik, Universität Regensburg — 4Fakultät für Physik, TU München — 5Institut Jean Lamour, Université Lorraine — 6Helmholtz-Zentrum Berlin

The transport of heat (or energy in general) in nanoscopic heterostructures is of great interest on a fundamental as well as a technological level, e.g. in the context of thermal management in devices or heat-assisted magnetic recording. In metal-insulator metaerostructures heat can be conducted by diffusion of electrons and/or lattice vibrations. Using time-resolved x-ray diffraction, we recently observed a surprisingly large thermal equilibration time between two ultrathin films of Au and Ni of more than 80 ps [1]. A detailed analysis revealed a significant contribution of lattice heat transport although electrons typically dictate the thermophysical properties in these metals. Here, we extend such experiments to metallic multilayers with an incorporated few-nm insulating MgO layer to suppress electron transport and calibrate the heat transport by phonon diffusion. At length scales smaller than the phonon mean free path ballistic transport is expected to efficiently contribute. We thus discuss the possibility of ballistic phonon transport in such systems. [1] Pudell et al. Nat. Commun. 9, 3335 (2018).

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