论文标题
拓扑半学中圆形光磁效应的低频差异
Low-Frequency Divergence of Circular Photomagnetic Effect in Topological Semimetals
论文作者
论文摘要
具有相对论线性色散的新型费米体可以作为拓扑半学材料中的低能激发出现。在这里，我们表明，这些拓扑半学的圆形光磁效应的轨道力矩贡献表现出非常规的$ω^{ - 1} $频率缩放，从而导致低频窗口中的响应显着增强，这可以比以前在常规材料上大的观测值大。此外，响应张量直接与出现的fermions的Chern数字有关，表现出它们的拓扑特征。我们的工作揭示了拓扑半学的新签名，并将其作为光电和旋转型应用程序的有前途的平台。
Novel fermions with relativistic linear dispersion can emerge as low-energy excitations in topological semimetal materials. Here, we show that the orbital moment contribution in the circular photomagnetic effect for these topological semimetals exhibit an unconventional $ω^{-1}$ frequency scaling, leading to significantly enhanced response in the low frequency window, which can be orders of magnitude larger than previous observations on conventional materials. Furthermore, the response tensor is directly connected to the Chern numbers of the emergent fermions, manifesting their topological character. Our work reveals a new signature of topological semimetals and suggests them as promising platforms for optoelectronics and spintronics applications.
