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arXiv 1302.2124cond-mat.mes-hall
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可调谐全电自旋偏振器

Tunable All Electric Spin Polarizer

J. Charles, N. Bhandari, J. Wan, M. Cahay, R. S. Newrock

摘要:

我们提出了一种新的设备,以创建一个可调谐的全电自旋极化器:量子点接触(QPC)与四个栅极-两个面内侧栅极串联。靠近源极的第一对栅极被非对称偏置以在QPC沟道中产生自旋极化。靠近漏极的第二组栅极被对称地偏置,并且该偏置被改变以使沟道中的自旋极化量最大化。与单对平面内侧栅极的情况相比,对于四栅极结构,可以实现最大自旋极化的第一组栅极上的共模偏置的范围宽得多。

英文摘要:

We propose a new device to create a tunable all-electric spin polarizer: a quantum point contact (QPC) with four gates -- two in-plane side gates in series. The first pair of gates, near the source, is asymmetrically biased to create spin polarization in the QPC channel. The second set of gates, near the drain, is symmetrically biased and that bias is varied to maximize the amount of spin polarization in the channel. The range of common mode bias on the first set of gates over which maximum spin polarization can be achieved is much broader for the four gate structure compared with the case of a single pair of in-plane side gates.

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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