Evidence for contact delocalization in atomic scale friction

Details Evidence for contact delocalization in atomic scale friction Evidence for contact delocalization in atomic scale friction

2007-07-20

arxiv.org/abs/0707.3072v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages text and 3 figures

Scientific paper

10.1103/PhysRevLett.99.166102

We analyze an advanced two-spring model with an ultra-low effective tip mass to predict nontrivial and physically rich 'fine structure' in the atomic stick-slip motion in Friction Force Microscopy (FFM) experiments. We demonstrate that this fine structure is present in recent, puzzling experiments. This shows that the tip apex can be completely or partially delocalized, thus shedding new light on what is measured in FFM and, possibly, what can happen with the asperities that establish the contact between macroscopic sliding bodies.

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