Effect of temperature and velocity on superlubricity

Abstract

We study the effects of temperature and sliding velocity on superlubricity in numerical simulations of the Frenkel-Kontorova model. We show that resonant excitations of the phonons in an incommensurate sliding body lead to an effective friction and to thermal equilibrium with energy distributed over the internal degrees of freedom. For finite temperature, the effective friction can be described well by a viscous damping force, with a damping coefficient that emerges naturally from the microscopic dynamics. This damping coefficient is a non-monotonic function of the sliding velocity which peaks around resonant velocities and increases with temperature. At low velocities, it remains finite and nonzero, indicating the preservation of superlubricity in the zero-velocity limit. Finally, we propose experimental systems in which our results could be verified.

References in corpus (6)

• Self-retracting motion of graphite micro-flakes: superlubricity in micrometer scale
• On the driven Frenkel-Kontorova model: I. Uniform sliding states and dynamical domains of different particle densities
• Parameter-free dissipation in simulated sliding friction
• Onset of sliding friction in incommensurate systems
• Role of surface roughness in superlubricity
• Breakdown of a conservation law in incommensurate systems

Cited by in corpus (8)

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• Analytic understanding and control of dynamical friction
• Atomic scale friction of molecular adsorbates during diffusion
• Emergent friction in two-dimensional Frenkel-Kontorova models
• Out-of-equilibrium Frenkel-Kontorova model
• Sliding states of a soft-colloid cluster crystal: Cluster versus single-particle hopping
• Friction on incommensurate substrates: Role of anharmonicity and defects