论文标题
在三维狄拉克半学中删除光引起的异常霍尔电导率的竞争机制
Disentangling the Competing Mechanisms of Light-Induced Anomalous Hall Conductivity in Three-Dimensional Dirac Semimetal
论文作者
论文摘要
我们通过三维狄拉克半学，CD $ _3 $为$ _2 $，在实验中阐明了异常大厅电导率的起源，由圆形偏振光驱动。使用时间分辨的Terahertz Faraday旋转光谱法，我们确定了瞬态霍尔电导率光谱，并特别注意其符号。我们的结果清楚地表明了Terahertz电场辅助的直接光电流产生的主导地位。当驾驶灯与带间过渡引起共鸣时，发现Floquet-Weyl节点的贡献是较小的。我们开发了通常适用于光引起的异常霍尔电导率的显微机制的分类。
We experimentally elucidate the origin of the anomalous Hall conductivity in a three-dimensional Dirac semimetal, Cd$_3$As$_2$, driven by circularly polarized light. Using time-resolved terahertz Faraday rotation spectroscopy, we determine the transient Hall conductivity spectrum with special attention to its sign. Our results clearly show the dominance of direct photocurrent generation assisted by the terahertz electric field. The contribution from the Floquet-Weyl nodes is found to be minor when the driving light is in resonance with interband transitions. We develop a generally applicable classification of microscopic mechanisms of light-induced anomalous Hall conductivity.
