Potsdam University Potsdam Quantum Optics Group

Universität Potsdam
Institut für Physik
Karl-Liebknecht-Str. 24/25
14476 Potsdam-Golm
Potsdam Quantum Optics Group: Home

Potsdam Quantum Optics Group: Teaching

Potsdam Quantum Optics Group: Research

Potsdam Quantum Optics Group: How to find us


M. Herzog, A. von Reppert, J. E. Pudell, C. Henkel, M. Kronseder, C. H. Back, A. Maznev, and M. Bargheer
Phonon-dominated energy transport in purely metallic heterostructures
accepted for publication in  Adv. Funct. Mater. (2022)


    We use ultrafast x-ray diffraction to quantify the transport of energy in laser-excited nanoscale 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 equilibration dynamics within various two-temperature models confirms that for ultrathin Au films the thermal transport is dominated by phonons instead of conduction electrons because of the weak electron-phonon coupling in Au.

[ arXiv:2203.14061 ] [ DOI ]

file generated: 6 Jul 2022

printer-friendly version