| Issue |
EPL
Volume 142, Number 4, May 2023
|
|
|---|---|---|
| Article Number | 46001 | |
| Number of page(s) | 6 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/acd140 | |
| Published online | 12 May 2023 | |
Friction on layered media: How deep do phonons reach?
1 Institute for Theoretical Physics, Georg-August-Universität Göttingen - 37073 Göttingen, Germany
2 Institute of Materials Physics, Georg-August-Universität Göttingen - 37073 Göttingen, Germany
(a) E-mail: miru.lee@uni-goettingen.de (corresponding author)
(b) E-mail: matthias.kruger@uni-goettingen.de
Received: 10 February 2023
Accepted: 28 April 2023
We theoretically study the frictional damping of a small probe object on a coated planar surface, analyzing the resulting phonon modes via a theory of viscoelasticity. Three different types of excitations are found to contribute to friction in distinct ways: traveling (3D) spherical waves, traveling (2D) surface waves, and evanescent waves. While traveling waves transport energy away from the probe, determined by long range elastic properties (wavelength), evanescent waves transform energy into heat in a near-field range, characterized by the size of the probe. Thus, fundamentally different behaviors are predicted, depending on coating thickness and material properties.
© 2023 The author(s)
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