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arXiv · 2109.10192

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

M. Merte·F. Freimuth·T. Adamantopoulos·D. Go·T. G. Saunderson·M. Kläui·L. Plucinski·O. Gomonay·S. Blügel·Y. Mokrousov
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Abstract

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

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M. Merte, F. Freimuth, T. Adamantopoulos, D. Go, T. G. Saunderson, M. Kläui, L. Plucinski, O. Gomonay, S. Blügel, Y. Mokrousov. 2021-09-21. Photocurrents of charge and spin in single-layer Fe$_3$GeTe$_2$. https://doi.org/10.1103/physrevb.104.l220405

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