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Surface control of flexoelectricity

Massimiliano Stengel
Phys. Rev. B 90, 201112(R) – Published 24 November 2014
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Abstract

The polarization response of a material to a strain gradient, known as flexoelectricity, holds great promise for novel electromechanical applications. Despite considerable recent progress, however, the effect remains poorly understood. From both the fundamental and practical viewpoints, it is of crucial importance to know whether the coupling coefficients are primarily governed by the properties of the bulk material or by the details of the sample surface. Here we provide, by means of first-principles calculations, quantitative evidence supporting the latter scenario. In particular, we demonstrate that a SrTiO3 film can yield a positive or negative voltage upon bending, depending on whether it is terminated by a TiO2 or SrO layer. This result points to a full control of the flexoelectric effect via surface/interface engineering, opening exciting new avenues for device design.

  • Figure
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  • Received 13 February 2014
  • Revised 29 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.201112

©2014 American Physical Society

Authors & Affiliations

Massimiliano Stengel

  • ICREA - Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain and Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain

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Issue

Vol. 90, Iss. 20 — 15 November 2014

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