Flexoelectric Modulation on the Two-Dimensional Electron Gas at (110) LaAlO3/SrTiO3 Interfaces,ACS Applied Energy Materials

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Flexoelectric Modulation on the Two-Dimensional Electron Gas at (110) LaAlO3/SrTiO3 Interfaces
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-18 00:00:00 , DOI: 10.1021/acsaelm.0c00349
Fan Zhang ₁ , Wei-Min Jiang ₂ , Cheng-Jian Li ₂ , Yangshi Jin ₁ , Zelong Wang ₁ , Jia-Cai Nie ₂ , Ji-yan Dai ₁

Affiliation

Flexoelectricity has been proven to be an effective way in tailoring a material’s properties. Here, we report the flexoelectricity-induced transport modulation to the two-dimensional electron gas at the (110) LaAlO₃/SrTiO₃ systems. Under different strain gradients induced by mechanical bending, the interfacial resistance changes according to the flexoelectric field directions. By measuring the electrical transport properties of the interface under variant strain states, we demonstrate that the modulation effect is affected by the oxygen partial pressure during film deposition. The electrical field effect model can thoroughly explain the observations. These findings further clarify the physical picture of flexoelectric effects in oxide heterostructures.

中文翻译：

在（110）LaAlO ₃ / SrTiO ₃界面上二维电子气的柔电调制

柔电已被证明是调整材料性能的有效方法。在这里，我们报道了在（110）LaAlO ₃ / SrTiO ₃系统中对二维电子气的挠曲诱导的传输调制。在机械弯曲引起的不同应变梯度下，界面电阻根据挠性电场方向而变化。通过测量在不同应变状态下界面的电传输性质，我们证明了在薄膜沉积过程中，调制效应受氧分压的影响。电场效应模型可以彻底解释观察结果。这些发现进一步阐明了氧化物异质结构中的柔电效应的物理现象。

更新日期：2020-06-18

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