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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 ManipulationNorio Okabayashi1, Thomas Frederiksen2,3, Alexander Liebig4, and •Franz J. Giessibl41Graduate 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

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