Abstract
We study the dynamic polarizability of a linear chain of atoms interconnected by springs and subjected to a double quadratic (D‐Q) or multiquadratic (M‐Q) substrate potential in the presence of a weak nonlinear coupling term between adjacent particles. The results obtained by Trullinger on the D‐Q model with linear coupling are reviewed and the same formalism is extended to calculate the modified kink waveform in the presence of nonlinear coupling and the dynamic polarizability of this modified kink. The simplicity of the model allows us to carry out analytically all the calculations. We show that the presence of kinks in such an anharmonic chain enhances the effect of coupling nonlinearities.
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