Transport properties of bare and hydrogenated zigzag silicene nanoribbons: Negative differential resistances and perfect spin-filtering effects
Transport properties of bare and hydrogenated zigzag silicene nanoribbons: Negative differential resistances and perfect spin-filtering effects
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DOI：
10.1063/1.4896630
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发表时间：
2014-09
影响因子：
3.2
通讯作者：
Xifeng Yang;Y. S. Liu;Jinfu Feng;Xinxin Wang;Chang-wen Zhang;F. Chi
中科院分区：
文献类型：
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作者：
Xifeng Yang;Y. S. Liu;Jinfu Feng;Xinxin Wang;Chang-wen Zhang;F. Chi
采用从头计算方法研究了裸硅纳米带和氢化硅纳米带的自旋极化输运性质。结果表明，具有对称（不对称）边的ZSiNRs具有半导体性质，其基态倾向于铁磁（反铁磁）态，而相应的反铁磁（铁磁）态则表现出金属性质。这些事实导致了在低偏置电压下铁磁态和反铁磁态之间的巨磁阻行为。此外，在边缘不对称的铁磁ZSiNRs中，通过改变偏置电压可以获得100%正电流极化的完美自旋滤波效果。此外，我们还发现负微分电阻更倾向于亚稳态。本文的研究结果表明，不对称和对称的ZSiNRs是一种很有前途的自旋电子材料。
Ab initio calculations are performed to investigate the spin-polarized transport properties of the bare and hydrogenated zigzag silicene nanoribbons (ZSiNRs). The results show that the ZSiNRs with symmetric (asymmetric) edges prefer the ferromagnetic (antiferromagnetic) as their ground states with the semiconductor properties, while the accordingly antiferromagnetic (ferromagnetic) states exhibit the metallic behaviors. These facts result in a giant magnetoresistance behavior between the ferromagnetic and antiferromagnetic states in the low bias-voltage regime. Moreover, in the ferromagnetic ZSiNRs with asymmetric edges, a perfect spin-filtering effect with 100% positive electric current polarization can be achieved by altering the bias voltage. In addition, we also find that the negative differential resistances prefer the metastable states. The findings here indicate that the asymmetric and symmetric ZSiNRs are promising materials for spintronic applications.