Local electric field induced spin photocurrent in ReS2

TL;DR

This study demonstrates that local electric fields near electrodes in ReS2 induce spin photocurrents via the inverse spin Hall effect, highlighting the importance of electric field control in spintronic device design.

Contribution

It reveals the role of local electric fields in generating spin photocurrents in ReS2 and how bias voltage modulates this effect, advancing understanding of spin transport mechanisms.

Findings

Circular polarized photocurrent observed at room temperature.

Electric field near electrodes influences spin transmission.

Bias voltage controls the sign and magnitude of the photocurrent.

Abstract

Circular polarized photocurrent is observed near the electrodes on a few-layer ReS2sample at room temperature. For both electrodes, the spatial distribution of the circular polarized photocurrent shows a feature of two wings, with one positive and the other negative. We suggest that this phenomenon arises from the inverse spin Hall effect due to local electric field near the electrode. Bias voltage that modulates this field further controls the sign and magnitude of the inverse spin Hall effect photocurrent. Our research shows that electric field near electrodes has a significant impact on spin transmission operation, hence it could be taken into account for manufacturing spintronic devices in future.