Dc-driven diatomic Frenkel-Kontorova model

We investigate the resonance steps, spatiotemporal dynamics, and dynamical phase diagrams of tile de-driven diatomic Frenkel-Kontorova model. The comp lete resonance velocity spectrum is given. The diatomic effects result in e ach resonant state being: characterized by two integer pairs, (k(1),k(2)) a nd (k(1),k ' (2)). In the high-velocity region the linear response of the a verage velocity , nu, of the chain to the driving force F is often punctuat ed by subharmonic resonances (k(1) > k(2)). There are two kinds of nonlinea r response regions in the high-velocity region. A new physical interpretati on of the mean-field treatment is presented.