Towards a bulk theory of flexoelectricity

Details Towards a bulk theory of flexoelectricity Towards a bulk theory of flexoelectricity

2010-08-04

arxiv.org/abs/1008.0837v1

Published (slightly shorter) as Phys. Rev. Lett. 105, 127601 (2010)

Physics

Condensed Matter

Materials Science

5 pages, 1 figure (2 panels)

Scientific paper

10.1103/PhysRevLett.105.127601

Flexoelectricity is the linear response of polarization to a strain gradient. Here we address the simplest class of dielectrics, namely elemental cubic crystals, and we prove that therein there is no extrinsic (i.e. surface) contribution to flexoelectricity in the thermodynamic limit. The flexoelectric tensor is expressed as a bulk response of the solid, manifestly independent of surface configurations. Furthermore, we prove that the flexoelectric responses induced by a long-wavelength phonon and by a uniform strain gradient are identical.

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