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arXiv 1102.0457cond-mat.mes-hall
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Fano-Rashba电导下降的干扰

Interference of Fano-Rashba conductance dips

A. Renart, M. M. Gelabert, L. Serra

摘要:

研究了单模传输量子线中两个可调谐Rashba区的干涉。两个区域的透射率下降(Fano-Rashba下降)根据两个区域之间的距离而交叉或反交叉。对于大的分离,我们发现法布里-珀罗振荡由于向前和向后传播模式的干扰。在小的分离重叠倏逝模式发挥突出的作用,导致增强的传输和破坏的电导下降。给出了散射矩阵理论中的解析表达式,并讨论了器件中干涉效应的相关性。

英文摘要:

We study the interference of two tunable Rashba regions in a quantum wire with one propagating mode. The transmission dips (Fano-Rashba dips) of the two regions either cross or anti cross depending on the distance between the two regions. For large separations we find Fabry-Pérot oscillations due to the interference of forwards and backwards propagating modes. At small separations overlapping evanescent modes play a prominent role, leading to an enhanced transmission and destroying the conductance dip. Analytical expressions in scattering-matrix theory are given and the relevance of the interference effect in a device is discussed.

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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