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In the realm of two-dimensional materials magnetic and transport propertiesof a unique representative $-$ Fe$_3$GeTe$_2$ $-$ attract ever increasingattention. Here, we use a developed first-principles method for calculatinglaser-induced response to study the emergence of photo-induced currents ofcharge and spin in single-layer Fe$_3$GeTe$_2$, which are of second order inthe electric field. We provide a symmetry analysis of the emergentphotocurrents in the system finding it to be in excellent agreement withab-initio calculations. We analyse the magnitude and behavior of the chargephotocurrents with respect to disorder strength, frequency and band filling.Remarkably, not only do we find a large charge current response, but alsopredict that Fe$_3$GeTe$_2$ can serve as a source of significant laser-inducedspin-currents, which makes this material as a promising platform for variousapplications in optospintronics.

Photocurrents of charge and spin in single-layer Fe$_3$GeTe$_2$