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arXiv 0909.3728cond-mat.mes-hall
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电子通过多端量子环的转移:磁力和弹性散射效应

Electron transfer through a multiterminal quantum ring: magnetic forces and elastic scattering effects

B. Szafran, M. R. Poniedzialek

摘要:

本文研究了弹性散射体存在于半导体量子环的一个臂中时,电子输运通过具有一个输入端和两个输出端的半导体量子环的输运。我们表明,散射体不仅引入了不对称的传输概率的两个输出引线,但也降低了Aharonov-Bohm电导振荡的可见性。这种减少发生在尽管弹性散射的相位相干性,是由于中断的电子循环周围的环的潜在缺陷。结果与Strambini等人最近的实验[Phys. Rev. B { \bf 79},195443(2009)]定性一致。我们还指出,在实验中获得的两个输出引线的电导之和的磁对称性可以理解为从反向散射的输入引线相对于磁场方向的不变性。

英文摘要:

We study electron transport through a semiconductor quantum ring with one input and two output terminals for an elastic scatterer present within one of the arms of the ring. We demonstrate that the scatterer not only introduces asymmetry in the transport probability to the two output leads but also reduces the visibility of the Aharonov-Bohm conductance oscillations. This reduction occurs in spite of the phase coherence of the elastic scattering and is due to interruption of the electron circulation around the ring by the potential defect. The results are in a qualitative agreement with a recent experiment by Strambini et al. [Phys. Rev. B {\bf 79}, 195443 (2009)]. We also indicate that the magnetic symmetry of the sum of conductance of both the output leads as obtained in the experiment can be understood as resulting from the invariance of backscattering to the input lead with respect to the magnetic field orientation.

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