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arXiv 1702.08348cond-mat.mes-hallcond-mat.str-el
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比例耦合之外的电导和近藤干涉

Conductance and Kondo Interference beyond Proportional Coupling

Luis G. G. V. Dias da Silva, Caio H. Lewenkopf, Edson Vernek, Gerson J. Ferreira, Sergio E. Ulloa

摘要:

纳米结构系统的输运性质深受金属引线有效连接的几何形状的影响。在这项工作中,我们推导出一个相互作用的系统,其连接的几何形状不满足Meir-Wingreen比例耦合条件的电导表达式。作为一个有趣的应用,我们考虑了一个量子点相干连接到可调谐电子腔模式。所示的结构表现出良好定义的近藤效应在很宽的范围内的两个子系统之间的耦合强度。与最近的实验结果相一致,计算的电导曲线表现出强烈的调制和不对称的行为,不同的腔模式被扫过费米能级。这些电导调制发生,但是,同时保持强大的近藤单线相关的点与电子水库,一个直接后果的不平衡性质的设备。

英文摘要:

The transport properties of nanostructured systems are deeply affected by the geometry of the effective connections to metallic leads. In this work we derive a conductance expression for interacting systems whose connectivity geometries do not meet the Meir-Wingreen proportional coupling condition. As an interesting application, we consider a quantum dot connected coherently to tunable electronic cavity modes. The structure is shown to exhibit a well-defined Kondo effect over a wide range of coupling strengths between the two subsystems. In agreement with recent experimental results, the calculated conductance curves exhibit strong modulations and asymmetric behavior as different cavity modes are swept through the Fermi level. These conductance modulations occur, however, while maintaining robust Kondo singlet correlations of the dot with the electronic reservoir, a direct consequence of the lopsided nature of the device.

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