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 Fext 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.
Static friction on the fly : velocity depinning transitions of lubricants in motion / A. Vanossi, N. Manini, F. Caruso, G.E. Santoro, E. Tosatti. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 99:20(2007), pp. 206101.206101.1-206101.206101.4. [10.1103/PhysRevLett.99.206101]
Static friction on the fly : velocity depinning transitions of lubricants in motion
N. ManiniSecondo
;
2007
Abstract
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 Fext 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.Pubblicazioni consigliate
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