Translational Covariance of Flexoelectricity at Ferroelectric Domain Walls

Oswaldo Diéguez, Massimiliano Stengel

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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 systematic procedure 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° domain walls in common ferroelectric perovskites, finding excellent agreement between the continuum model and direct first-principles calculations.

Original languageEnglish
Article number031002
JournalPhysical Review X
Issue number3
StatePublished - Jul 2022


FundersFunder number
MICINN-SpainCEX2019-000917-S, PID2019–108573 GB-C22
Horizon 2020 Framework Programme724529
European Research Council
Generalitat de Catalunya2017 SGR1506
Israel Science Foundation1814/14, 2143/14
Ministerio de Ciencia e Innovación


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