Hydrogenations and electric field induced magnetic behaviors in armchair silicene nanoribbons.

Dan Zhang,Mengqiu Long,Yongli Gao,Fang Xie,Jun Ouyang,Hui Xu

doi:10.1038/srep23677

Abstract

Using the first-principles calculations, we investigate the geometric, electronic and magnetic properties of armchair silicene nanoribbons with different edge hydrogenations. Our results show that the interesting magnetic behaviors such as the bipolar magnetic semiconductor can be found. Moreover, the addition of the transverse electric field can modulate the bipolar magnetic semiconductor to half-metal or spin-splitting metal. And the spin-up electrons are localized at one edge, the spin-down holes localized at the opposite edge under the external electric field. These results may present a new avenue for band engineering of silicene nanoribbons and benefit the design of silicon-based nano-spin-devices in nanoelectronics.

Highlights

Interestingly, the charge carriers are spin polarized in energy space and spatially separated at different edges under the external electric field
For M2(7A), we can see the spin-down density of state (DOS) appears a peak above the Fermi level (FL), while the spin-up DOS is non-localized below the FL, which corresponding to the two subbands near the FL (shown in Fig. 2(b)), respectively
The charge carriers are spin polarized in energy space, and spatially separated at different edges under the external electric field, which would supply a new method to separate electrons and holes with different spins

Summary

Introduction

Interestingly, the charge carriers are spin polarized in energy space and spatially separated at different edges under the external electric field. The effect of the nanoribbon width have been considered, the ground states and corresponding magnetic moments for different edge hydrogenated

Results

Conclusion