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首页> 外文期刊>Physical review >Interplay of Kondo and superconducting correlations in the nonequilibrium Andreev transport through a quantum dot
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Interplay of Kondo and superconducting correlations in the nonequilibrium Andreev transport through a quantum dot

机译：通过量子点的非平衡安德列夫输运中的近藤相互作用和超导相关

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摘要

Using the modified perturbation theory, we theoretically study the nonequilibrium Andreev transport through a quantum dot coupled to normal and superconducting leads (N-QD-S), which is strongly influenced by the Kondo and superconducting correlations. From the numerical calculation, we find that the renormalized couplings between the leads and the dot in the equilibrium states characterize the peak formation in the nonequilibrium differential conductance. In particular, in the Kondo regime, the enhancement of the Andreev transport via a Kondo resonance occurs in the differential conductance at a finite bias voltage, leading to an anomalous peak whose position is given by the renormalized parameters. In addition to the peak, we show that the energy levels of the Andreev bound states give rise to other peaks in the differential conductance in the strongly correlated N-QD-S system. All these features of the nonequilibrium transport are consistent with those in the recent experimental results [Deacon et al., Phys. Rev. Lett. 104, 076805 (2010); Phys. Rev. B 81, 121308 (2010)]. We also find that the interplay of the Kondo and superconducting correlations induces an intriguing pinning effect of the Andreev resonances to the Fermi level and its counter position.
机译：使用修正的扰动理论，我们从理论上研究了通过量子点耦合到正常和超导引线（N-QD-S）的非平衡安德列夫输运，这受到近藤和超导相关性的强烈影响。从数值计算中，我们发现处于平衡状态的引线和点之间的重新归一化耦合表征了非平衡差分电导中的峰形成。特别地，在近藤法中，通过近藤共振的安德列夫传输的增强发生在有限偏置电压下的差分电导中，导致异常峰，其位置由重新归一化的参数给出。除峰值外，我们还表明，在强相关的N-QD-S系统中，Andreev束缚态的能级会引起差分电导的其他峰值。非平衡转运的所有这些特征与最近的实验结果一致[Deacon et al。，Phys。牧师104，076805（2010）;物理B 81，121308（2010）。我们还发现，近藤和超导相关的相互作用引起了安德烈耶夫共振对费米能级及其反位的吸引作用。

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