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arXiv 1007.3308cond-mat.mes-hallcond-mat.str-el
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干涉对量子点中近藤效应的影响

The Influence of Interference on the Kondo Effect in a Quantum Dot

Justin Malecki, Ian Affleck

摘要:

我们研究了一个量子点嵌入Aharanov-Bohm环中的模型系统中的近藤效应。通过转换到直接铅间隧穿的散射基础,我们能够精确地描述点自旋的近藤屏蔽是如何发生的。我们计算了近藤温度和零温电导,发现它们都受到Aharanov-Bohm环和引线中电子密度的影响。我们还计算了一个额外的潜在的散射项,由于打破粒子-空穴对称性在低能量产生的形式。我们的许多结果得到了数值重整化群的数值分析的支持。

英文摘要:

We study the Kondo effect in a model system of a quantum dot embedded in an Aharanov-Bohm ring connected to two leads. By transforming to the scattering basis of the direct inter-lead tunneling, we are able to describe precisely how the Kondo screening of the dot spin occurs. We calculate the Kondo temperature and zero-temperature conductance and find that both are influenced by the Aharanov-Bohm ring as well as the electron density in the leads. We also calculate the form of an additional potential scattering term that arises at low energies due to the breaking of particle-hole symmetry. Many of our results are supported by numerical analysis using the numerical renormalization group.

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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