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.

Analytic understanding and control of dynamical friction / Panizon, Emanuele; Santoro, Giuseppe E.; Tosatti, Erio; Riva, Gabriele; Manini, Nicola. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 97:10(2018), pp. 1-10. [10.1103/PhysRevB.97.104104]

Analytic understanding and control of dynamical friction

Panizon, Emanuele
;
Santoro, Giuseppe E.;Tosatti, Erio;
2018

Abstract

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.
97
10
1
10
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.104104
https://arxiv.org/abs/1802.04509
Panizon, Emanuele; Santoro, Giuseppe E.; Tosatti, Erio; Riva, Gabriele; Manini, Nicola
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/87915
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