Weymouth, A. J. and Meuer, D. and Mutombo, P. and Wutscher, T. and Ondracek, M. and Jelinek, P. and Giessibl, F. J. (2013) Atomic Structure Affects the Directional Dependence of Friction. PHYSICAL REVIEW LETTERS, 111 (12): 126103. ISSN 0031-9007,
Full text not available from this repository. (Request a copy)Abstract
Friction between two objects can be understood by the making, stretching, and breaking of thousands of atomic-scale asperities. We have probed single atoms in a nonisotropic surface [the H-terminated Si(100) surface] with a lateral force microscope operating in noncontact mode. We show that these forces are measurably different, depending upon the direction. Experimentally, these differences are observable in both the line profiles and the maximum stiffnesses. Density functional theory calculations show a concerted motion of the whole Si dimer during the tip-sample interaction. These results demonstrate that on an asperity-by-asperity basis, the surface atomic structure plays a strong role in the directional dependence of friction.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SCALE FRICTION; FORCE MICROSCOPE; SINGLE-ATOM; SURFACE; ANISOTROPY; RESOLUTION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Mar 2020 12:18 |
| Last Modified: | 31 Mar 2020 12:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16025 |
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