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arXiv 0710.1803cond-mat.mes-hall
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超导导线耦合量子点的近藤普适标度

Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads

Christo Buizert, Akira Oiwa, Kenji Shibata, Kazuhiro Hirakawa, Seigo Tarucha

摘要:

我们研究了与Al侧电极接触的单个自组装InAs量子点中近藤效应与超导电性之间的竞争。由于近藤增强的Andreev反射的零偏置异常发展的侧峰,分开的超导能隙能量δ。对于不同近藤温度T_K的十个谷,我们用外部磁场调节间隙Δ。我们发现在每种情况下的零偏压电导崩溃到一个单一的曲线与Delta/kT_K作为唯一相关的能量标度,提供了实验证据,在这个系统中的普遍标度。

英文摘要:

We study competition between the Kondo effect and superconductivity in a single self-assembled InAs quantum dot contacted with Al lateral electrodes. Due to Kondo enhancement of Andreev reflections the zero-bias anomaly develops sidepeaks, separated by the superconducting gap energy Delta. For ten valleys of different Kondo temperature T_K we tune the gap Delta with an external magnetic field. We find that the zero-bias conductance in each case collapses onto a single curve with Delta/kT_K as the only relevant energy scale, providing experimental evidence for universal scaling in this system.

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