Dc-Driven Diatomic Frenkel-Kontorova Model

Aiguo Xu; Jongbae Hong

paper

Dc-Driven Diatomic Frenkel-Kontorova Model

arXiv:cond-mat/0302056

Abstract

We investigate the resonance steps, spatiotemporal dynamics, and dynamical phase diagrams of the dc-driven diatomic Frenkel-Kontorova model. The complete resonance velocity spectrum is given. The diatomic effects result in each resonant state being characterized by two integer pairs, $(k_{1}, k_{2})$ and $(k_{1}, k_{2}^{'})$ . In the high-velocity region the linear response of the average velocity, $v$ , of the chain to the driving force $F$ is often punctuated by subharmonic resonances $(k_{1} > k_{2})$ . There are two kinds of nonlinear response regions in the high-velocity region. A new physical interpretation of the mean-field treatment is presented.

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