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Orbitronics is based on the use of orbit currents as information carriers. Upto now, orbit currents were created from the conversion of charge or spincurrents, and inversely, they could be converted back to charge or spincurrents. Here we demonstrate that orbit currents can also be generated byfemtosecond light pulses on Ni. In multilayers associating Ni with oxides andnonmagnetic metals such as Cu, we detect the orbit currents by their conversioninto charge currents and the resulting terahertz emission. We show that theorbit currents extraordinarily predominate the light-induced spin currents inNi-based systems, whereas only spin currents can be detected with CoFeB-basedsystems. In addition, the analysis of the time delays of the terahertz pulsesleads to relevant information on the velocity and propagation of orbitcarriers. Our finding of light-induced orbit currents and our observation oftheir conversion into charge currents opens new avenues in orbitronics,including the development of orbitronic terahertz devices.

Orbitronics: Light-induced Orbit Currents in Terahertz Emission Experiments