Layer Hall Detection of the Néel Vector in Centrosymmetric Magnetoelectric Antiferromagnets,Physical Review Letters

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Layer Hall Detection of the Néel Vector in Centrosymmetric Magnetoelectric Antiferromagnets
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-08-30 , DOI: 10.1103/physrevlett.133.096803
L L Tao ₁ , Qin Zhang ₁ , Huinan Li ₁ , Hong Jian Zhao _{2,

3} , Xianjie Wang ₁ , Bo Song ₄ , Evgeny Y Tsymbal ₅ , Laurent Bellaiche _{6,

7}

Affiliation

The efficient detection of the Néel vector in antiferromagnets is one of the prerequisites toward antiferromagnetic spintronic devices and remains a challenging problem. Here, we propose that the layer Hall effect can be used to efficiently detect the Néel vector in centrosymmetric magnetoelectric antiferromagnets. Thanks to the robust surface magnetization of magnetoelectric antiferromagnets, the combination of sizable exchange field and an applied electric field results in the layer-locked spin-polarized band edges. Moreover, the Berry curvature can be engineered efficiently by an electric field, which consequently gives rise to the layer-locked Berry curvature responsible for the layer Hall effect. Importantly, it is demonstrated that the layer Hall conductivity strongly depends on the Néel vector orientation and exhibits rich electromagnetic responses, which can be used to detect the Néel vector reversal. Based on density functional theory calculations, we exemplify those phenomena in the prototypical

{Cr}_{2} O_{3}

compound. A complete list of the magnetic point groups sustaining the layer Hall effect is presented, aiding the search for realistic materials. Our work proposes a novel approach to detect the Néel vector and holds great promise for antiferromagnetic spintronic applications.

中文翻译：

中心对称磁电反铁磁体中尼尔矢量的层霍尔检测

反铁磁体中尼尔矢量的有效检测是反铁磁自旋电子器件的先决条件之一，并且仍然是一个具有挑战性的问题。在这里，我们提出层霍尔效应可用于有效检测中心对称磁电反铁磁体中的尼尔矢量。由于磁电反铁磁体具有强大的表面磁化强度，相当大的交换场和外加电场的结合产生了层锁定的自旋极化带边缘。此外，贝里曲率可以通过电场有效地设计，从而产生导致层霍尔效应的层锁定贝里曲率。重要的是，事实证明，层霍尔电导率强烈依赖于尼尔矢量方向，并表现出丰富的电磁响应，可用于检测尼尔矢量反转。基于密度泛函理论计算，我们在原型中举例说明了这些现象