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arXiv 1609.07640cond-mat.str-elcond-mat.mes-hallcond-mat.supr-con
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振动量子点中的非弹性Kondo-Andreev隧穿

Inelastic Kondo-Andreev tunnelings in a vibrating quantum dot

Zhan Cao, Tie-Feng Fang, Qing-Feng Sun, Hong-Gang Luo

摘要:

在近藤机制下研究了声子辅助的电子隧穿通过嵌入在正常引线和超导引线之间的振动量子点。在这样的混合器件中,与正常的铅施加的偏压,我们发现了一系列的近藤边带分离的半个声子能量的微分电导,这是不同于声子辅助边带先前观察到的常规Andreev隧道和系统中只有正常的铅。这些Kondo边带起源于声子介导的Kondo-Andreev合作共隧穿,由于近藤效应、Andreev隧穿和机械振动的相互作用,Kondo边带表现出一种新的Kondo输运行为.我们的结果可以在最近的实验设置中观察到[J. Gramich \emph{et al.},PRL \textbf{115},216801(2015)],前提是他们的碳纳米管器件在低温下达到Kondo状态。

英文摘要:

Phonon-assisted electronic tunnelings through a vibrating quantum dot embedded between normal and superconducting leads are studied in the Kondo regime. In such a hybrid device, with the bias applied to the normal lead, we find a series of Kondo sidebands separated by half a phonon energy in the differential conductance, which are distinct from the phonon-assisted sidebands previously observed in the conventional Andreev tunnelings and in systems with only normal leads. These Kondo sidebands originate from the Kondo-Andreev cooperative cotunneling mediated by phonons, which exhibit a novel Kondo transport behavior due to the interplay of the Kondo effect, the Andreev tunnelings, and the mechanical vibrations. Our result could be observed in a recent experiment setup [J. Gramich \emph{et al.}, PRL \textbf{115}, 216801 (2015)], provided that their carbon nanotube device reaches the Kondo regime at low temperatures.

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