论文标题
Weyl半法的拓扑反向法拉第效应
Topological Inverse Faraday Effect in Weyl Semimetals
论文作者
论文摘要
我们证明，在Weyl半学中，动量空间螺旋自旋纹理可以与Weyl节点的手性相结合，以通过Faraday效应来响应圆形极化光，从而产生频率独立的磁化。这种频率独立性植根于Weyl节点的拓扑结构。由于螺旋性和手性总是锁定在Weyl节点上，因此这种效果不受任何对称约束。最后，我们表明，光诱导的频率独立磁化强度对晶格效应具有鲁棒性，并且具有足够大的幅度，足以实现Picsecond以下的超快全光磁化切换。
We demonstrate that in Weyl semimetals, the momentum-space helical spin texture can couple to the chirality of the Weyl node to generate a frequency-independent magnetization in response to circularly polarized light through the inverse Faraday effect. This frequency-independence is rooted in the topology of the Weyl node. Since the helicity and the chirality are always locked for Weyl nodes, this effect is not subject to any symmetry constraint. Finally, we show that the photoinduced frequency-independent magnetization is robust against lattice effect and has a magnitude large enough to realize ultrafast all-optical magnetization switching below picosecond.
