Inverse orbital Hall effect and orbitronic terahertz emission observed in the materials with weak spin-orbit coupling

The Orbital Hall effect, which originates from materials with weak spin-orbit coupling, has attracted considerable interest for spin-orbitronic applications. Here, we demonstrate the inverse effect of the orbital Hall effect and observe orbitronic terahertz emission in the Ti and Mn materials. Through spin-orbit transition in the ferromagnetic layer, the generated orbital current can be converted to charge current in the Ti and Mn layers via the inverse orbital Hall effect. Furthermore, the inserted W layer provides an additional conversion of the orbital-charge current in the Ti and Mn layers, significantly enhancing the orbitronic terahertz emission. Moreover, the orbitronic terahertz emission can be manipulated by cooperating with the inverse orbital Hall effect and the inverse spin Hall effect in the different sample configurations. Our results not only discover the physical mechanism of condensed matter physics but also pave the way for designing promising spin-orbitronic devices and terahertz emitters.

Automated summary

We demonstrate the inverse Orbital Hall effect and observe orbitronic terahertz emission in Ti and Mn materials. The generated orbital current via spin-orbit transition can be converted to charge current through the inverse Orbital Hall effect. The inserted W layer further enhances the orbitronic terahertz emission by converting the orbital-charge current in Ti and Mn layers. The cooperation between the inverse Orbital Hall effect and the inverse Spin Hall effect can manipulate the orbitronic terahertz emission in different sample configurations. Our findings unveil the physical mechanism of condensed matter physics and facilitate the design of spin-orbitronic devices and terahertz emitters.