$\mathrm{RbCr_2Se_2O}$ 中的压电霍尔效应
Piezo-Hall effect in $\mathrm{RbCr_2Se_2O}$
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中文总结 AI 辅助
本研究提出压电霍尔效应概念，通过第一性原理计算在 $\mathrm{RbCr_2Se_2O}$ 中验证了应变诱导磁性空间群转变从而产生反常霍尔效应的机制，并扩展了相关效应。
中文摘要 AI 辅助
反常霍尔效应（AHE）对于理解磁性材料中的自旋-轨道耦合和磁输运具有根本重要性。同时，应变可以显著改变材料性质，压电效应便是众所周知的代表。压电霍尔效应将反常霍尔效应与应变这两个物理要素结合起来。具体而言，压电霍尔效应描述了一个物理过程：磁性材料在原始状态下，其磁性空间群（MSG）禁止净磁矩并抑制反常霍尔效应，但在施加应变后，材料转变为允许净磁矩的新磁性空间群，从而使反常霍尔效应得以出现。其潜在机制包括应变诱导的磁电子态转变以及应变对磁化方向的调控。我们以 $d$ 波交错磁金属为例，详细分析了压电霍尔效应，并对具体材料 $\mathrm{RbCr_2Se_2O}$ 进行了第一性原理计算以验证这一场景。一个显著的结果是，在沿 $x$ 和 $y$ 方向施加相同的单轴应变时，反常霍尔电导率表现出符号相反但大小相等的值。类似地，还可以提出压电磁光效应；如果将应变调控替换为电场调制，则可以相应提出电霍尔效应和电磁光效应。甚至温度也可以作为外场来引入温度霍尔效应。我们的工作增进了对应变与物理性质之间耦合的理解。
英文摘要
The anomalous Hall effect (AHE) is of fundamental importance for understanding spin-orbit coupling and magnetic transport in magnetic materials. Meanwhile, strain can significantly modify material properties, and the piezoelectric effect stands as a well-known representative. The piezo-Hall effect combines the two physical ingredients of AHE and strain. Specifically, the piezo-Hall effect describes a physical process in which the magnetic space group (MSG) of a magnetic material prohibits a net magnetic moment and suppresses the AHE in the pristine state but transforms into a new MSG upon strain application that permits a net magnetic moment, thereby enabling the emergence of the AHE. The underlying mechanisms cover strain-induced magnetic electronic state transition and strain tuning of magnetization direction. We take the $d$-wave altermagnetic metal as an example to analyze the piezo-Hall effect in detail, with first-principles calculations carried out on the specific material $\mathrm{RbCr_2Se_2O}$ to verify this scenario. A notable result is that under identical uniaxial strain applied along the $x$ and $y$ directions, the anomalous Hall conductivity exhibits opposite signs but equal magnitudes. Similarly, the piezo-magneto-optical effect can also be proposed, and if strain tuning is replaced by electric-field modulation, the electro-Hall effect and electro-magneto-optical effect can be also put forward accordingly. Even temperature can serve as an external field to introduce the temperature Hall effect. Our work advances the understanding of the coupling between strain and physical properties.
发表机构
- School of Electronic Engineering, Xi’an University of Posts and Telecommunications（西安邮电大学电子工程学院）
- School of Physics and Electronics, Hunan University（湖南大学物理与微电子学院）
- Institute for Quantum Science, School of Physical Science and Technology, Soochow University（苏州大学物理科学与技术学院量子科学研究所）
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