Symmetry-protected difference between spin Hall and anomalous Hall effects of a periodically driven multiorbital metal

Abstract

Nonequilibrium quantum states can be controlled via the driving field in periodically driven systems. Such control, which is called Floquet engineering, has opened various phenomena, such as the light-induced anomalous Hall effect. There are expected to be some essential differences between the anomalous Hall and spin Hall effects of periodically driven systems because of the difference in time-reversal symmetry. However, these differences remain unclear due to the lack of Floquet engineering of the spin Hall effect. Here we show that when the helicity of circularly polarized light is changed in a periodically driven $t_{2g}$-orbital metal, the spin current generated by the spin Hall effect remains unchanged, whereas the charge current generated by the anomalous Hall effect is reversed. This difference is protected by the symmetry of a time reversal operation. Our results offer a way to distinguish the spin current and charge current via light and could be experimentally observed in pump-probe measurements of periodically driven Sr${}_2$RuO${}_4$.

arXiv comment9 pages, 4 figures

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Cited by in corpus (5)

• Light-induced large and tunable valley-selective Hall effect in a centrosymmetric system
• Light-Induced Mirror Symmetry Breaking and Charge Transport
• Optically tunable spin Hall effect in periodically driven monolayer transition metal dichalcogenides
• Light-induced inverse spin Hall effect and field-induced circular photogalvanic effect in GaAs revealed by two-dimensional terahertz Fourier analysis
• Onsager Reciprocal Relations for Charge and Spin Transport in Periodically Driven Systems