Friction between incommensurate crystals
Résumé
We present an overview of friction processes expected between two ideal crystals of strong layers (graphite, MoS©ü...) when one crystal is rotated with respect to the other by a certain angle ¥è. We assume perfect conditions: no impurities; no preexisting dislocations in the bulk of the crystals; slow gliding velocities. Two regimes show up: a) weak coupling when ¥è>U©û/U_{L}, where U©û (U_{L}) are typical intra (inter) layer interactions. Here we expect weak friction, controled by 2 phonon processes, and analyzed by Sokoloff et al. However we point out that surface waves at the interface also play a role; b) strong coupling (¥è
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