论文标题
部分可观测时空混沌系统的无模型预测
Giant Magnetochiral Anisotropy in Weyl-semimetal WTe2 Induced by Diverging Berry Curvature
论文作者
论文摘要
浆果曲率的概念对于各种运输现象至关重要。然而，浆果曲率对磁性疾病各向异性的影响，即非雷诺磁电流，仍然难以捉摸。在这里，我们报告浆果曲率起源于大型磁性病毒各向异性。在Weyl-Amimetal WTE2中，当Fermi水平位于Weyl点附近时，我们观察到了磁化导管各向异性的强大增强。值得注意的是，优点$ \barγ$的最大数字达到$ 1.2 \，{\ times} 10^{ - 6} \ rm {m^2t^{ - 1} a^{ - 1}} $，这是有史以来最大的批量材料。我们的半经典计算表明，在Weyl点处的分化浆果曲率强烈增强了磁性障碍物的各向异性。
The concept of Berry curvature is essential for various transport phenomena. However, an effect of the Berry curvature on magnetochiral anisotropy, i.e. nonreciprocal magneto-transport, is still elusive. Here, we report the Berry curvature originates the large magnetochiral anisotropy. In Weyl-semimetal WTe2, we observed the strong enhancement of the magnetochiral anisotropy when the Fermi level is located near the Weyl points. Notably, the maximal figure of merit $\barγ$ reaches $1.2\,{\times}10^{-6} \rm{m^2T^{-1}A^{-1}}$, which is the largest ever reported in bulk materials. Our semiclassical calculation shows that the diverging Berry curvature at the Weyl points strongly enhances the magnetochiral anisotropy.
