arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06913cond-mat.mtrl-sci
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类铁电金属非线性霍尔效应的电学检测

Electrical Detection of Ferroelectric-like Metals through Nonlinear Hall Effect

Rui-Chun Xiao, Ding-Fu Shao, Wenjuan Huang, Hua Jiang

摘要:

类铁电金属是一类相对罕见的具有类铁电畸变和金属导电性的材料。LiOsO $_3$是第一个被证实的和研究最多的类铁电金属。自由载流子的存在使得传统的铁电技术很难对其进行研究。本文通过对称性分析和第一性原理计算,证明了LiOsO $_3$的类铁电相变可以用一种基于非线性霍尔效应的电输运方法来研究。在类铁电相中存在Berry曲率偶极子,利用常规的实验装置,可以得到可测量的非线性霍尔电导。然而,类顺电相LiOsO $_3$的对称性使Berry曲率偶极子消失。Berry曲率偶极子对极位移有很强的依赖性,这可能有助于极序的检测。非线性霍尔效应为类铁电金属研究中相变的检测提供了一种有效的方法,促进了类铁电金属在类铁电电子器件中的应用。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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