Static properties of two-component kink in a non-linear discrete polarizability model Original Research Article

We study analytically, in the low-velocity regime, the static properties of two-component kink in a discrete polarizability model with a quartic electron–ion interaction in one ionic species. Using a discretized Hamiltonian formalism, we derive the exact equations of motion for the two-component kink centre of the mass X(t) and coupled field variables. Numerical analysis is performed to estimate the amplitude of the dressing and its effects on the static properties of the discrete lattice for the potassium selenate (K2SeO4) at T=40 K. We find that dressing has important effects on dynamical quantities such as the pinning frequency and the depth of the Peierls–Nabarro potential. Two-component kink contributions to the specific heat have been also analysed both in the continuum and the discrete limits.