[2P01-29] Poster session

[2P02] Numerical analysis of velocity- and damping-dependent atomic-scale friction using a one-dimensional Tomlinson model

*Yu Fukushima¹, Naruo Sasaki¹ (1. Graduate School of Informatics and Engineering, The University of Electro-Communications (Japan))

The Tomlinson model describes atomic-scale friction when a solid surface is scanned by atomic force microscopy. In this work, we performed numerical simulations using a one-dimensional Tomlinson model for various damping coefficients and scanning velocities. The frictional force curves obtained from the simulations were classified into several dynamical regimes, including a stick-slip regime at low sliding velocities, a nonlinear oscillation regime at intermediate velocities under weak damping, and a small-oscillation regime at high velocities. Based on this classification, we constructed a regime map as a function of scanning velocity and damping coefficient. We then estimated the characteristic time scales of the damped motion after a slip event, namely the oscillation period and the relaxation time. By comparing these time scales with the scanning time over one lattice period, we successfully explain the origin of each dynamical regime in the regime map.

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