Friction on adsorbed monolayers

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Abstract
Molecular-dynamics simulations and analytical calculations are used to investigate the mechanism of energy dissipation in monolayer films sliding across a substrate. An explanation is given for the viscous friction found experimentally in both fluid and incommensurate solid adsorbates, and for the observation that solids slide more easily than fluids. We show that anharmonic coupling of phonons in the adsorbed monolayer can account for the rate of energy dissipation seen in these experiments. © 1996 The American Physical Society.