2026-04-13T02:56:55Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1528102025-12-05T11:00:26Zcom_2072_1057col_2072_478907col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Quapp, Wolfgang author Bofill i Villà, Josep M. author 2020-03-17T10:32:23Z 2020-05-08T05:10:26Z 2019-05-08 2020-03-17T10:32:24Z We study a Frenkel{Kontorova (FK) model of a nite chain with free-end boundary conditions. The model has two competing potentials. Newton trajectories are an ideal tool to understand the circumstances under a driving of an FK chain by external forces. To reach the insights we calculate some stationary structures for a chain with 23 particles. We search the lowest energy saddle points for a complete minimum energy path of the chain for a movement over the full period of the on-site potential, a sliding. If an additional tilting is set, then one is interested in barrier breakdown points (BBPs) on the potential energy surface for a critical tilting force named the static frictional force. In symmetric cases, such BBPs are often valley-ridge in ection points of the potential energy surface. We explain the theory and demonstrate it with an example. We propose a model for a DC drive, as well as an AC drive, of the chain using special directional vectors of the external force. Teories no lineals Matèria condensada Química física Nonlinear theories Condensed matter Physical and theoretical chemistry A model for a driven Frenkel-Kontorova chain