论文标题
通过非线性大厅效应对铁电的电检测
Electrical Detection of Ferroelectric-like Metals through Nonlinear Hall Effect
论文作者
论文摘要
铁电样金属是一种相对罕见的材料类，具有铁电性变形和金属电导率。 lioso $ _3 $是第一个证明，也是调查最多的类铁电金属。自由载体的存在使得它们难以通过传统的铁电技术研究。在本文中，使用对称分析和第一原理计算，我们证明了Lioso $ _3 $的铁电样过渡可以通过基于非线性霍尔效应的一种电气传输方法来探测。浆果曲率偶极子存在于铁电阶段，它可以通过常规的实验设置导致可测量的非线性霍尔电导。但是，类似副层的lioso $ _3 $的对称性消失了浆果曲率偶极子。浆果曲率偶极子对极性位移有很强的依赖性，这可能有助于检测极顺序。非线性霍尔效应在研究类似铁电的金属的研究中为检测相变的有效方法，并促进将其应用于铁电电子设备中。
Ferroelectric-like metals are a relatively rare class of materials that have ferroelectric-like distortion and metallic conductivity. LiOsO$_3$ is the first demonstrated and the most investigated ferroelectric-like metal. The presence of free carriers makes them difficult to be studied by traditional ferroelectric techniques. In this paper, using the symmetry analysis and first-principles calculations, we demonstrate that the ferroelectric-like transition of LiOsO$_3$ can be probed by a kind of electrical transport method based on nonlinear Hall effect. The Berry curvature dipole exists in the ferroelectric-like phase, and it can lead to a measurable nonlinear Hall conductance with a conventional experimental setup. However, the symmetry of the paraelectric-like phase LiOsO$_3$ vanishes the Berry curvature dipole. The Berry curvature dipole shows a strong dependence on the polar displacement, which might be helpful for the detection of polar order. The nonlinear Hall effect provides an effective method for the detection of phase transition in the study of the ferroelectric-like metals and promotes them to be applied in the ferroelectric-like electronic devices.
