论文标题
通过轴向异常，磁性Weyl半含量的域壁的电动操纵
Electric manipulation of domain walls in magnetic Weyl semimetals via the axial anomaly
论文作者
论文摘要
我们展示了轴向（手性）异常如何在磁性Weyl半法中诱导自旋扭矩。当应用非正交的电场和磁场时，异常在左和右手的手性载体中产生不平衡。这种失衡会产生旋转密度，从而在磁化强度上施加扭矩，其强度可以通过施加的电场的强度来控制。我们通过延迟Walker崩溃的开始，展示了这如何导致对域壁的手性的电控制以及域壁动力学的改善。电场介导的域壁手性变化的测量将构成轴向异常的直接证明。此外，我们还展示了与域壁结合的电子费米电弧状态的量子波动自然会诱导有效的磁各向异性，即使磁性Weyl semimetal的固有各向异性很小，也可以产生高域壁速度。
We show how the axial (chiral) anomaly induces a spin torque on the magnetization in magnetic Weyl semimetals. The anomaly produces an imbalance in left- and right-handed chirality carriers when non-orthogonal electric and magnetic fields are applied. Such imbalance generates a spin density which exerts a torque on the magnetization, the strength of which can be controlled by the intensity of the applied electric field. We show how this results in an electric control of the chirality of domain walls, as well as in an improvement of the domain wall dynamics, by delaying the onset of the Walker breakdown. The measurement of the electric field mediated changes in the domain wall chirality would constitute a direct proof of the axial anomaly. Additionally, we show how quantum fluctuations of electronic Fermi arc states bound to the domain wall naturally induce an effective magnetic anisotropy, allowing for high domain wall velocities even if the intrinsic anisotropy of the magnetic Weyl semimetal is small.
