NONLINEAR MOBILITY OF THE GENERALIZED FRENKEL-KONTOROVA MODEL

摘要: Nonlinear mobility of one-and two-dimensional systems interacting atoms in response to the dc external force is studied framework a generalized Frenkel-Kontorova model. The are subjected three-dimensional potential periodic two dimensions and parabolic third dimension. When increases, system exhibits transition from low-mobility regime high-mobility regime, latter corresponds running state inclined substrate potential. During passes through intermediate states depending on whether concentration ground-state atomic structure with simple or complex elementary cell. All transitions first-order dynamical-phase transitions, i.e., they discontinuous exhibit hysteresis even at nonzero temperature. simulation results explained phenomenological approach, which treats strongly as weakly quasiparticles ~kinks!. @S1063-651X~97!02403-3#