Strong surface effect on direct bulk flexoelectric response in solids
Strong surface effect on direct bulk flexoelectric response in solids
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DOI：
10.1063/1.4939975
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发表时间：
2016-01
影响因子：
4
通讯作者：
A. S. Yurkov;A. Tagantsev
中科院分区：
文献类型：
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作者：
A. S. Yurkov;A. Tagantsev
在连续统理论的框架下，证明了有限样品的直接体挠曲电响应本质上取决于表面极化能，即使在体尺寸趋于无穷大的热力学极限下也是如此。结果表明，表面能的改变可使极化响应变化两倍。该效应的来源是由应变梯度引起的表面偶极子产生的电场。在热力学极限下，极化响应对表面能的意外灵敏度是由表面偶极矩可以随物体尺寸缩放这一事实决定的。
In the framework of a continuum theory, it is shown that the direct bulk flexoelectric response of a finite sample essentially depends on the surface polarization energy, even in the thermodynamic limit where the body size tends to infinity. It is found that a modification of the surface energy can lead to a change in the polarization response by a factor of two. The origin of the effect is an electric field produced by surface dipoles induced by the strain gradient. The unexpected sensitivity of the polarization response to the surface energy in the thermodynamic limit is conditioned by the fact that the moments of the surface dipoles may scale as the body size.