Title: Phonon‐Dominated Energy Transport in Purely Metallic Heterostructures

Journal Article · · Advanced Functional Materials
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Institut für Physik &, Astronomie Universität Potsdam Karl‐Liebknecht‐Str. 24‐25 14476 Potsdam Germany
  2. Institut für Physik &, Astronomie Universität Potsdam Karl‐Liebknecht‐Str. 24‐25 14476 Potsdam Germany, Helmholtz Zentrum Berlin Albert‐Einstein‐Str. 15 12489 Berlin Germany, European XFEL Holzkoppel 4 22869 Schenefeld Germany
  3. Institut für Experimentelle und Angewandte Physik Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany, Physics Department Technical University Munich 85748 Garching Germany
  4. Physics Department Technical University Munich 85748 Garching Germany
  5. Department of Chemistry Massachusetts Institute of Technology Cambridge MA 02139 USA
  6. Institut für Physik &, Astronomie Universität Potsdam Karl‐Liebknecht‐Str. 24‐25 14476 Potsdam Germany, Helmholtz Zentrum Berlin Albert‐Einstein‐Str. 15 12489 Berlin Germany

Abstract 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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515; SC0019126
OSTI ID:
1881509
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 41 Vol. 32; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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