Analytic understanding and control of dynamical friction

Recent model simulations discovered unexpected nonmonotonic features in the wear-free dry phononic friction as a function of the sliding speed. Here we demonstrate that a rather straightforward application of linear-response theory, appropriate in a regime of weak slider-substrate interaction, predi...

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Bibliographic Details
Published in:Physical review. B 2018-03, Vol.97 (10), Article 104104
Main Authors: Panizon, Emanuele, Santoro, Giuseppe E, Tosatti, Erio, Riva, Gabriele, Manini, Nicola
Format: Article
Language:English
Subjects:
Computer simulation
Dependence
Friction
Singularities
Substrates
X-ray astronomy
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Summary:Recent model simulations discovered unexpected nonmonotonic features in the wear-free dry phononic friction as a function of the sliding speed. Here we demonstrate that a rather straightforward application of linear-response theory, appropriate in a regime of weak slider-substrate interaction, predicts frictional one-phonon singularities which imply a nontrivial dependence of the dynamical friction force on the slider speed and/or coupling to the substrate. The explicit formula which we derive reproduces very accurately the classical atomistic simulations when available. By modifying the slider-substrate interaction the analytical understanding obtained provides a practical means to tailor and control the speed dependence of friction with substantial freedom.
ISSN:2469-9950
2469-9969
DOI:10.1103/physrevb.97.104104