Inverse spin Hall photocurrent in thin-film WSe2

At room temperature, spin-dependent photocurrents were observed near the electrodes of few-layer WSe2 samples under circularly polarized light excitation. The spin photocurrent exhibits a bipolar distribution with opposite signs on the two sides of the same electrode. This phenomenon is attributed to the inverse spin Hall effect originating from photoexcited spin-polarized carriers. By tuning the parameters associated with spin-polarized carrier generation, the magnitude of the spin photocurrent can be effectively modulated. Our research shows that external field control significantly influences spin transport, providing a quantitative basis for the design of spin-photovoltaic and opto-spintronic devices based on two-dimensional materials.