Magnetically tunable spin filtering in semiconductor nanowires.
Magnetically tunable spin filtering in semiconductor nanowires.
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DOI：
10.1166/jnn.2010.2755
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发表时间：
2010-11
影响因子：
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通讯作者：
Rui-Li Zhang;Jiashu Zhang;Jia Li;Qing Hu;R. Peng;Mu Wang
中科院分区：
文献类型：
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作者：
Rui-Li Zhang;Jiashu Zhang;Jia Li;Qing Hu;R. Peng;Mu Wang
研究了对称半导体纳米线中的共振传输和自旋过滤，其中Rashba自旋轨道耦合（SOC）通过施加外电场对称分布。结果表明，在半导体衬底上形成了电子带隙结构，提高SOC的强度可以增大带隙的宽度;在电子带隙中发现了共振传输现象，具有理想的传输峰。有趣的是，通过引入弱磁调制，自旋向上和自旋向下的电子的透射谱被分离。随着SSN中心段长度的增加，带隙中出现了多个自旋相关的完全透射峰。可以操纵其中的谐振能量和谐振传输模式的数量。在共振能量附近，观察到高自旋极化，并在该SSN中获得完全自旋极化电导。我们的研究在自旋滤波器中具有潜在的应用。
We investigate resonant transmission and spin filtering in symmetric semiconductor nanowires (SSNs), where Rashba spin-orbit coupling (SOC) is symmetrically distributed by applying external electric field. It is shown that electronic bandgap structure has been formed, and the width of the bandgap can be enlarged by increasing the strength of SOC. Resonant transmission has been found in the electronic bandgap, which is characterized by perfect transmission peak. Interestingly, by introducing a weak magnetic modulation, the transmission spectra of spin-up and spin-down electrons are separated. With increasing the length of the centre segment in the SSN, multiple spin-dependent perfect transmission peaks appear in the bandgap. The resonant energy and the number of modes of resonant transmission therein can be manipulated. Around resonant energy, high spin-polarization is observed, and fully spin-polarized conductance is obtained in this SSN. Our investigations achieve potential applications in spin filters.