Zigzag hexagonal phosphorene quantum dot as a spin inverter in the presence of Rashba effect

In this study, we investigate the spin polarized current in a zigzag hexagonal phosphorene quantum dot composed of  and  phosphorus atoms using Green's function method. Supposing that all input electrons have spin-up orientation, we have shown that an output current with desirable spin polarization may be achieved by applying an appropriate external electric field controlled by a gate voltage. Particularly, there are conditions where the spin of all electrons can be inverted; therefore, the system can act as a spin inverter that has special applications in spintronics and quantum computations. Moreover, it is demonstrated that increasing the size of phosphorene quantum dot leads to the increase of polarized current.