Kink dynamics with oscillating forces

TL;DR

This paper extends the understanding of kink dynamics in one-dimensional systems by showing that oscillating forces can produce stable configurations, and introduces a generalized derivation applicable to various free energy models, improving simulation efficiency.

Contribution

It introduces a new derivation of kink dynamics for generalized Ginzburg-Landau models with oscillating forces, applicable beyond specific approximations.

Findings

Kink interactions can oscillate, leading to stable configurations.

The new derivation accurately reproduces full model dynamics.

Simulation time is significantly reduced using the new approach.

Abstract

It is well known that the dynamics of a one-dimensional dissipative system driven by the Ginzburg-Landau free energy may be described in terms of interacting kinks: two neighbouring kinks at distance $\ell$ feel an attractive force $F(\ell)\approx\exp(-\ell)$. This result is typical of a bistable system whose inhomogeneities have an energy cost due to surface tension, but for some physical systems bending rigidity rather than surface tension plays a leading role. We show that a kink dynamics is still applicable, but the force $F(\ell)$ is now oscillating, therefore producing configurations which are locally stable. We also propose a new derivation of kink dynamics, which applies to a generalized Ginzburg-Landau free energy with an arbitrary combination of surface tension, bending energy, and higher-order terms. Our derivation is not based on a specific multikink approximation and the resulting kink dynamics reproduces correctly the full dynamics of the original model. This allows to use our derivation with confidence in place of the continuum dynamics, reducing simulation time by orders of magnitude.