Surface-Phonon-Induced Rotational Dissipation for Nanoscale Solid-State Gears

Compared to nanoscale friction of translational motion, the mechanisms rotational have received less attention. Such motion becomes an important issue for miniaturization mechanical machinery that often involves rotating gears. In this study, molecular-dynamics simulations are performed explore solid-state gears on top different substrates. each case, viscous damping is observed and found be induced by pure van der Waals interaction between gear substrate. The influence sizes various substrate materials investigated. Furthermore, rigidities give rise dissipation channels. Finally, it shown dominant contribution related excitation low-frequency surface phonons in