Dc-Driven Diatomic Frenkel-Kontorova Model.pdfVIP

Dc-Driven Diatomic Frenkel-Kontorova Model Aiguo Xu and Jongbae Hong Department of Physics and Center for Strongly Correlated 3 0 0 Materials Research, Seoul National University, 2 b Seoul 151-742, Korea e F We investigate the resonance steps, spatiotemporal dynamics, and dy- 3 namical phase diagrams of the dc-driven diatomic Frenkel-Kontorova model. ] i The complete resonance velocity spectrum is given. The diatomic effects re- c s l- sult in each resonant state being characterized by two integer pairs, (k ,k ) 1 2 r t and (k ,k′ ). In the high-velocity region the linear response of the average m 1 2 . t a velocity , v, of the chain to the driving force F is often punctuated by subhar- m - monic resonances (k k ). There are two kinds of nonlinear response regions 1 2 d n o in the high-velocity region. A new physical interpretation of the mean-field c [ treatment is presented. 1 v PACS: 05.70.Ln, 46.10.+z; 64.60.Fr 6 5 0 2 0 3 0 / t a m - d n o c : v i X r a 1 The static and the transport properties of Frenkel-Kontorova(FK) [1] systems have been subjects of intensive studies [2–4]. In these studies, one of the most important parameters is the winding number ω [5]. Starting from uniform sliding states, Strunz and Elmer [6] pre- sented the main, superharmonic resonant conditions while Zheng et al [7] gave the complete resonance c