Controllable valley and spin transports in ferromagnetic silicene junctions

TL;DR

This paper explores how charge, valley, and spin transport in ferromagnetic silicene junctions can be controlled and tuned using electric fields and gate voltages, enabling fully polarized currents.

Contribution

It demonstrates the controllability of valley and spin polarized currents in silicene junctions through electric and magnetic tuning, revealing conditions for fully polarized transport.

Findings

Charge, valley, and spin conductances oscillate with ferromagnetic silicene length.

Valley and spin polarizations are tunable via gate voltage.

Fully valley and spin polarized current can be achieved with electric field.

Abstract

We investigate charge, valley, and spin transports in normal/ferromagnetic/normal silicene junc- tion. We show that the charge, valley, and spin conductances in this junction oscillate with the length of the ferromagnetic silicene. It is also found that the current through this junction is valley and spin polarized due to the coupling between valley and spin degrees of freedom, and the valley and spin polarizations can be tuned by local application of a gate voltage. In particular, we find fully valley and spin polarized current by applying the electric field. We also obtain the condition for observing the fully valley and spin polarized current.