The dragging velocity of a model solid lubricant confined between sliding periodic substrates exhibits a phase transition between two regimes, respectively, with quantized and with continuous lubricant center-of-mass velocity. The transition, occurring for increasing external driving force F-ext acting on the lubricant, displays a large hysteresis, and has the features of depinning transitions in static friction, only taking place on the fly. Although different in nature, this phenomenon appears isomorphic to a static Aubry depinning transition in a Frenkel-Kontorova model, the role of particles now taken by the moving kinks of the lubricant-substrate interface. We suggest a possible realization in 2D optical lattice experiments.
|Titolo:||Static friction on the fly: Velocity depinning transitions of lubricants in motion|
|Autori:||Vanossi A; Manini N; Caruso F; Giuseppe E. Santoro; Tosatti E|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.99.206101|
|Appare nelle tipologie:||1.1 Journal article|