Translational covariance of flexoelectricity at ferroelectric domain walls

TL;DR

This paper develops a systematic approach to connect microscopic lattice modes with macroscopic ferroelectric properties, revealing translational covariance in flexoelectricity at domain walls and validating the model with first-principles calculations.

Contribution

It introduces a two-way mapping between inhomogeneous fields and lattice modes, clarifies the arbitrariness in flexoelectric coefficients, and demonstrates the covariance in ferroelectric domain wall models.

Findings

Arbitrariness in flexoelectric coefficients cancels out in physical properties.

Continuum model agrees well with first-principles calculations.

Translational covariance holds in inhomogeneous ferroelectric structures.

Abstract

Macroscopic descriptions of ferroelectrics have an obvious appeal in terms of efficiency and physical intuition. Their predictive power, however, has often been thwarted by the lack of a systematicp rocedure to extract the relevant materials parameters from the microscopics. Here we address this limitation by establishing an unambiguous two-way mapping between spatially inhomogeneous fields and discrete lattice modes. This yields a natural treatment of gradient couplings in the macroscopic regime via a long-wavelength expansion of the crystal Hamiltonian. Our analysis reveals an inherent arbitrariness in both the flexoelectric and polarization gradient coefficients, which we ascribe to a translational freedom in the definition of the polar distortion pattern. Remarkably, such arbitrariness cancels out in all physically measurable properties (relaxed atomic structure and energetics) derived from the model, pointing to a generalized translational covariance in the continuum description of inhomogeneous ferroelectric structures. We demonstrate our claims with extensive numerical tests on 180-degree domain walls in common ferroelectric perovskites, finding excellent agreement between the continuum model and direct first-principles calculations.