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arXiv 0704.3799cond-mat.mes-hall
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通过Rashba和弱磁调制实现自旋滤波

Spin filtering implemented through Rashba and weak magnetic modulations

S. J. Gong, Z. Q. Yang

摘要:

提出了两种在空间调制的Rashba自旋轨道耦合(SOC)和弱磁势下的一维半导体量子线中自旋滤波器的理论方案。对于情况I,SOC是周期性的,并且弱磁势沿导线均匀施加。在两个分离的能量区间内获得了符号相反的全自旋极化。对于第二种情况,弱磁位是周期性的,而SOC是均匀的。通过调节SOC的强度,实现了自旋极化的正负转换,分析了SOC、磁势及其耦合对自旋过滤的影响。

英文摘要:

We present two theoretical schemes for spin filters in one-dimensional semiconductor quantum wires with spatially modulated Rashba spin-orbit coupling (SOC) as well as weak magnetic potential. For case I, the SOC is periodic and the weak magnetic potential is applied uniformly along the wire. Full spin polarizations with opposite signs are obtained within two separated energy intervals. For case II, the weak magnetic potential is periodic while the SOC is uniform. An ideal negative/positive switching effect for spin polarization is realized by tuning the strength of SOC. The roles of SOC, magnetic potential, and their coupling on the spin filtering are analyzed.

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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