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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lombard, J. Detcheverry, F. Merabia, S. |
| Description | Country affiliation: France Author Affiliation: Lombard J ( Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne, France.) |
| Abstract | Thermal boundary conductance at a metal-dielectric interface is a quantity of prime importance for heat management at the nanoscale. While the boundary conductance is usually ascribed to the coupling between metal phonons and dielectric phonons, in this work we examine the influence of a direct coupling between the metal electrons and the dielectric phonons. The effect of electron-phonon processes is generally believed to be resistive and tends to decrease the overall thermal boundary conductance as compared to the phonon-phonon conductance σ(p). Here, we find that the effect of a direct electron-phonon interfacial coupling σ(e) is to enhance the effective thermal conductance between the metal and the dielectric. Resistive effects turn out to be important only for thin films of metals that have a low electron-phonon coupling strength. Two approaches are explored to reach these conclusions. First, we present an analytical solution of the two-temperature model to compute the effective conductance which accounts for all the relevant energy channels, as a function of σ(e), σ(p) and the electron-phonon coupling factor G. Second, we use numerical resolution to examine the influence of σ(e) on two realistic cases: a gold film on silicon or silica substrates. We point out the implications for the interpretation of time-resolved thermoreflectance experiments. |
| ISSN | 09538984 |
| e-ISSN | 1361648X |
| Journal | Journal of Physics: Condensed Matter |
| Issue Number | 1 |
| Volume Number | 27 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2015-01-14 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Discipline Condensed Matter Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Materials Science |
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