论文标题
新的非共线铁磁性Weyl半含量具有各向异性异常效应
A new noncollinear ferromagnetic Weyl semimetal with anisotropic anomalous Hall effect
论文作者
论文摘要
凝结物理学中的发展前沿是新型电磁反应的出现，例如拓扑和异常霍尔效应（AHE），在铁磁Weyl半法（FM-WSMS）中的出现。 FM-WSM的候选物仅限于保留反转对称的材料，并通过打破时间反转对称性来产生Weyl交叉。这些材料具有三个共同的特征：中心对称晶格，串联FM订购以及当场平行于磁性轴线时观察到的大AHE。在这里，我们将CEALSI作为一种新型的FM-WSM提出，其中Weyl节点通过打破反转对称性而稳定，但是它们的位置是通过打破时间反转对称性来调节的。与其他FM-WSM不同，CEALSI具有非中心晶格，非共线FM订购，以及在易于使用和硬轴之间的新颖AHE。它还表现出大型FM域，对于设备应用以及Weyl节点和FM域壁之间的相互作用都是有希望的。
A developing frontier in condensed matter physics is the emergence of novel electromagnetic responses, such as topological and anomalous Hall effect (AHE), in ferromagnetic Weyl semimetals (FM-WSMs). Candidates of FM-WSM are limited to materials that preserve inversion symmetry and generate Weyl crossings by breaking time-reversal symmetry. These materials share three common features: a centrosymmetric lattice, a collinear FM ordering, and a large AHE observed when the field is parallel to the magnetic easy-axis. Here, we present CeAlSi as a new type of FM-WSM, where the Weyl nodes are stabilized by breaking inversion symmetry, but their positions are tuned by breaking time-reversal symmetry. Unlike the other FM-WSMs, CeAlSi has a noncentrosymmetric lattice, a noncollinear FM ordering, and a novel AHE that is anisotropic between the easy- and hard-axes. It also exhibits large FM domains that are promising for both device applications and an interplay between the Weyl nodes and FM domain walls.
