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arXiv 2307.15420cond-mat.mes-hall
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平面霍尔实验中反常霍尔效应的缺失

Absence of the anomalous Hall effect in planar Hall experiments

C. M. Wang, Z. Z. Du, Hai-Zhou Lu, X. C. Xie

AI总结:

本文解释了平面霍尔实验中周期为 $2π/3$ 的反常平面霍尔效应缺失的原因,指出无序贡献和镜面反射对称性破坏导致的传统 $π$ 周期效应掩盖了反常效应,并提出通过面内应变增强反常霍尔电导率及从实验数据中提取隐藏电导率的方案。

摘要:

最近,平面霍尔效应引起了极大的关注。特别是,对于六角翘曲能带,面内磁化可以诱导出周期为 $2π/3$ 的反常平面霍尔效应。这种效应类似于由面外磁化引起的反常霍尔效应。然而,在平面霍尔实验中并未观察到这种反常平面霍尔效应。在这里,我们通过计算解释了其缺失的原因,该计算不仅包含了以往理论中的 Berry 曲率机制,还包含了无序贡献。如果镜面反射对称性被破坏,将会出现传统的 $π$ 周期平面霍尔效应,从而掩盖了反常效应。我们表明,面内应变可以增强反常霍尔电导率,并将周期从 $2π/3$ 改变为 $2π$。我们提出了一种方案,可以从实验数据中提取隐藏的反常平面霍尔电导率。我们的工作将有助于检测反常平面霍尔效应,并且可以推广到理解广泛材料中平面霍尔效应的机制。

英文摘要:

Recently, the planar Hall effect has attracted tremendous interest. In particular, an in-plane magnetization can induce an anomalous planar Hall effect with a $2π/3$ period for hexagon-warped energy bands. This effect is similar to the anomalous Hall effect resulting from an out-of-plane magnetization. However, this anomalous planar Hall effect is absent in the planar Hall experiments. Here, we explain its absence, by performing a calculation that includes not only the Berry curvature mechanism as those in the previous theories, but also the disorder contributions. The conventional $π$-period planar Hall effect will occur if the mirror reflection symmetry is broken, which buries the anomalous one. We show that an in-plane strain can enhance the anomalous Hall conductivity and changes the period from $2π/3$ to $2π$. We propose a scheme to extract the hidden anomalous planar Hall conductivity from the experimental data. Our work will be helpful in detecting the anomalous planar Hall effect and could be generalized to understand mechanisms of the planar Hall effects in a wide range of materials.

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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