arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.4909cond-mat.mes-hall
收藏

量子线中拉什巴-塞曼效应诱导的自旋过滤能窗

Rashba-Zeeman-effect-induced spin filtering energy windows in a quantum wire

Xianbo Xiao, Zhaoxia Chen, Wenjie Nie, Guanghui Zhou, Fei Li

摘要:

采用改进的Rankki转移矩阵方法结合Landauer-Buttiker方法,对Rashba自旋轨道耦合(SOC)和垂直磁场(MF)调制下量子线中的自旋分辨输运进行了数值研究.对于自旋非极化注入,该系统可以获得较宽的自旋过滤能窗。此外,这些能量窗口的宽度和这些能量窗口内的自旋电导的大小可以通过改变Rashba SOC强度来调节,这可以通过分析量子阱内的能量色散和自旋极化密度分布来理解。进一步的研究还表明,这些Rashba-SOC控制的自旋过滤能量窗口显示出强大的鲁棒性对疾病。这些结果不仅有助于进一步理解量子阱在外场作用下的自旋相关输运性质,而且为自旋过滤器件的设计提供了理论指导。

英文摘要:

We perform a numerical study on the spin-resolved transport in a quantum wire (QW) under the modulation of both Rashba spin-orbit coupling (SOC) and a perpendicular magnetic field (MF) by adopting the developed Usuki transfer-matrix method in combination with the Landauer-Buttiker formalism. Wide spin filtering energy windows can be achieved in this system for a spin-unpolarized injection. In addition, both the width of these energy windows and the magnitude of the spin conductance within these energy widows can be tuned by varying the Rashba SOC strength, which can be apprehended by analyzing the energy dispersions and the spin-polarized density distributions inside the QW, respectively. Further study also demonstrates that these Rashba-SOC-controlled spin filtering energy windows show a strong robustness against disorders. These findings may not only benefit to further understand the spin-dependent transport properties of the QW in the presence of external fields but also provide a theoretical instruction to design a spin filter device.

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。

↑