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Phonon‐Dominated Energy Transport in Purely Metallic Heterostructures

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Herzog, Marc ; von Reppert, Alexander ; Pudell, Jan‐Etienne ; Henkel, Carsten ; Kronseder, Matthias ; Back, Christian H. ; Maznev, Alexei A. ; Bargheer, Matias
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Date of publication of this fulltext: 07 Feb 2023 05:39


Ultrafast X-ray diffraction is used to quantify the transport of energy in laser-excited nanoscale gold–nickel (Au–Ni) bilayers. Electron transport and efficient electron–phonon coupling in Ni convert the laser-deposited energy in the conduction electrons within a few picoseconds into a strong non-equilibrium between hot Ni and cold Au phonons at the bilayer interface. Modeling of the subsequent ...


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