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

Abstract

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.

14 pages, 3 figures, 1 table

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• Light-induced anomalous Hall conductivity in massive 3D Dirac semimetal Co${}_3$Sn${}_2$S${}_2$
• Chiral Floquet Engineering on Topological Fermions in Chiral Crystals
• Programmable generation of counterrotating bicircular light pulses in the multi-terahertz frequency range
• Anomalous Hall transport by optically injected isospin degree of freedom in Dirac semimetal thin film
• Five-dimensional Floquet topological semimetals with emergent Yang monopoles and linked Weyl surfaces
• Floquet theory and applications in open quantum and classical systems
• Light-induced inverse spin Hall effect and field-induced circular photogalvanic effect in GaAs revealed by two-dimensional terahertz Fourier analysis
• Unified theory of the photovoltaic Hall effect by field- and light-induced Berry curvatures