Abstract
When an external force acts on an adsorbate structure, the structure may slide or flow relative to the substrate. The mechanism behind this sliding motion is of fundamental importance for the understanding of friction and lubrication between two flat macroscopic surfaces, and is also related to the question of what boundary condition should be used for the velocity field at a solid-liquid interface when solving the Navier-Stokes equations of fluid dynamics. Here I study the friction which occurs when an adsorbate structure slides on a metallic surface. I show that for metals the electronic friction dominate over the friction due to phonon emission, at least for the weak-adsorption systems considered in this paper. I present results of simulations based on Langevin or Brownian-motion dynamics, where the dependenceof the sliding friction on the temperature and on the coverage is studied for weak-adsorption systems, and in the light of the theoretical results I discuss the experimental quartz-crystal microbalance data of Krim.
Published Version
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