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We experimentally elucidate the origin of the anomalous Hall conductivity ina three-dimensional Dirac semimetal, Cd$_3$As$_2$, driven by circularlypolarized light. Using time-resolved terahertz Faraday rotation spectroscopy,we determine the transient Hall conductivity spectrum with special attention toits sign. Our results clearly show the dominance of direct photocurrentgeneration assisted by the terahertz electric field. The contribution from theFloquet-Weyl nodes is found to be minor when the driving light is in resonancewith interband transitions. We develop a generally applicable classification ofmicroscopic mechanisms of light-induced anomalous Hall conductivity.

Disentangling the Competing Mechanisms of Light-Induced Anomalous Hall Conductivity in Three-Dimensional Dirac Semimetal