Phonon-dominated energy transport in purely metallic heterostructures
- 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 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.
| Author details: | Marc HerzogORCiDGND, Alexander von ReppertORCiDGND, Jan-Etienne PudellORCiDGND, Carsten HenkelORCiDGND, Matthias Kronseder, Christian H. Back, Alexei A. Maznev, Matias BargheerORCiDGND |
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| DOI: | https://doi.org/10.1002/adfm.202206179 |
| ISSN: | 1616-301X |
| ISSN: | 1616-3028 |
| Title of parent work (English): | Advanced functional materials |
| Publisher: | Wiley-VCH |
| Place of publishing: | Weinheim |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2022/08/15 |
| Publication year: | 2022 |
| Release date: | 2024/06/07 |
| Tag: | heterostructures; nanoscale energy transports; non-equilibrium; thermal; transports; ultrafast phenomena |
| Volume: | 32 |
| Issue: | 41 |
| Article number: | 2206179 |
| Number of pages: | 8 |
| Funding institution: | Deutsche Forschungsgemeinschaft (DFG, German Research Foundation); [2281/11-1]; U.S. Department of Energy; Projekt DEAL |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
| Publishing method: | Open Access / Hybrid Open-Access |
| License (German): |  CC-BY - Namensnennung 4.0 International |
