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arXiv 1206.1114cond-mat.mes-hall
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硅烯纳米粒子中局域交换场诱导的自旋极化电流

Spin-polarized current induced by a local exchange field in a silicene nanoribbon

Xing-Tao An, Yan-Yang Zhang, Jian-Jun Liu, Shu-Shen Li

摘要:

预测了在两端锯齿形硅烯纳米管中产生自旋极化电流的机制。当在硅烯纳米粒子的一个边缘上施加一个平行于硅烯表面的弱局域交换场时,在相应的无带隙边缘态中打开了一个能隙,但另一对自旋相反的无带隙边缘态仍然受到时间反演对称性的保护。因此,在这个双端系统中,在由局部交换场打开的间隙中可以感生自旋极化电流。重要的是,即使在没有Rashba自旋轨道耦合和交换场很弱的情况下,也可以获得自旋极化电流。也就是说,产生自旋极化电流的机制在实验上很容易实现,而且自旋极化电流对弱无序不敏感。

英文摘要:

A mechanism to generate a spin-polarized current in a two-terminal zigzag silicene nanoribbon is predicted. As a weak local exchange field that is parallel to the surface of silicene is applied on one of edges of the silicene nanoribbon, a gap is opened in the corresponding gapless edge states but another pair of gapless edge states with opposite spin are still protected by the time-reversal symmetry. Hence, a spin-polarized current can be induced in the gap opened by the local exchange field in this two-terminal system. What is important is that the spin-polarized current can be obtained even in the absence of Rashba spin-orbit coupling and in the case of the very weak exchange filed. That is to say, the mechanism to generate the spin-polarized currents can be easily realized experimentally.We also find that the spin-polarized current is insensitive to weak disorder.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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