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arXiv 1509.04801cond-mat.str-el
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正常金属/铁磁体-量子点-超导体器件中的Fano共振

Fano resonance in a normal metal/ferromagnet-quantum dot-superconductor device

Lin Li, Zhan Cao, Hong-Gang Luo, Fu-Chun Zhang, Wei-Qiang Chen

摘要:

我们从理论上研究了Andreev输运通过与正常金属/铁磁体和超导体强耦合的量子点(N/F-QD-S),其中Kondo共振和Andreev束缚态(ABS)之间的相互作用还没有被清楚地阐明.在这里,我们表明,近藤共振和ABS之间的干扰严重修改的近藤共振,表现为法诺共振的线形。具有自旋极化的铁磁铅诱导出一个有效场,导致近藤共振和ABS的分裂。自旋极化与所施加的磁场一起提供了调谐近藤共振的线形的替代方式,这取决于近藤共振和ABS的相对位置。这些结果表明,近藤共振和ABS之间的相互作用可以显着影响Andreev输运,这可以通过实验来验证。

英文摘要:

We investigate theoretically the Andreev transport through a quantum dot strongly coupled with a normal metal/ferromagnet and a superconductor (N/F-QD-S), in which the interplay between the Kondo resonance and the Andreev bound states (ABSs) has not been clearly clarified yet. Here we show that the interference between the Kondo resonance and the ABSs modifies seriously the lineshape of the Kondo resonance, which manifests as a Fano resonance. The ferromagnetic lead with spin-polarization induces an effective field, which leads to splitting both of the Kondo resonance and the ABSs. The spin-polarization together with the magnetic field applied provides an alternative way to tune the lineshape of the Kondo resonances, which is dependent of the relative positions of the Kondo resonance and of the ABSs. These results indicate that the interplay between the Kondo resonance and the ABSs can significantly affect the Andreev transport, which could be tested by experiments.

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