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arXiv 1707.02015cond-mat.mes-hall
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硅烯纳米带中原子吸附诱导的自旋极化电流

Spin-polarized electric current in silicene nanoribbons induced by atomic adsorption

C. Núñez, P. A. Orellana, L. Rosales, R. A. Römer, F. Domínguez-Adame

摘要:

我们研究了硅烯扶手椅型纳米粒子的非平衡输运性质,该纳米粒子的顶点位置吸附原子随机分布。生长在纳米晶下方的铁磁绝缘体分裂自旋向上和自旋向下的电子带,并引起电导的自旋极化。当费米能级与吸附原子能级匹配时,由于吸附原子局域态与纳米晶体的连续谱的耦合,电导为零。这就是众所周知的Fano效应,导致电导中的自旋相关反共振。自旋向上和自旋向下电子的不同反共振能量导致电导在宽的能量窗口内完全自旋极化。这种自旋相关的Fano效应打开了在自旋电子学中使用它作为极化电子的可调谐源的可能性。

英文摘要:

We investigate the nonequilibrium transport properties of a silicene armchair nanoribbon with a random distribution of adsorbed atoms in apex positions. A ferromagnetic insulator grown below the nanoribbon splits spin-up and spin-down electron bands and gives rise to a spin polarization of the conductance. The conductance vanishes when the Fermi energy matches the adatom levels due to the coupling of adatom localized states with the continuum spectra of the nanoribbon. This is the well-known Fano effect, resulting in a spin-dependent antiresonance in the conductance. The different antiresonance energies of spin-up and spin-down electrons give rise to a full spin polarization of the conductance in a broad energy window. This spin-dependent Fano effect opens the possibility to using it in spintronics as a tuneable source of polarized electrons.

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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