Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 27: Tribology
O 27.2: Talk
Tuesday, March 19, 2024, 10:45–11:00, MA 144
Dynamic Friction Unraveled by Observing an Unexpected Intermediate State in Controlled Molecular Manipulation — Norio Okabayashi1, Thomas Frederiksen2,3, Alexander Liebig4, and •Franz J. Giessibl4 — 1Graduate School of Natural Science and Technology, Kanazawa University, Ishikawa 920-1192, Japan — 2Donostia International Physics Center (DIPC), San Sebastián 20018, Spain — 3IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain — 4Institute of Experimental and Applied Physics, University of Regensburg, Regensburg D-93053, Germany
The pervasive phenomenon of friction has been studied at the nanoscale via a controlled manipulation of single atoms and molecules with a metallic tip, which enabled a precise determination of the static friction force necessary to initiate motion. However, little is known about the atomic dynamics during manipulation. Here, we reveal the complete manipulation process of a CO molecule on a Cu(110) surface at low temperatures using a combination of noncontact atomic force microscopy and density functional theory simulations. We found that an intermediate state, inaccessible for the far-tip position, is enabled in the reaction pathway for the close-tip position, which is crucial to understanding the manipulation process, including dynamic friction. Our results show how friction forces can be controlled and optimized, facilitating new fundamental insights for tribology [1].
[1] N. Okabayashi, Th. Frederiksen, A. Liebig, F.J. Giessibl, Phys. Rev. Lett. 131, 148001 (2023).
Keywords: Atomic manipulation; Friction; Surfaces; Atomic Force Microscopy