Electrical control of Kondo effect and superconducting transport in a side-gated InAs quantum dot Josephson junction
Electrical control of Kondo effect and superconducting transport in a side-gated InAs quantum dot Josephson junction
复制标题
DOI：
10.1103/physrevb.82.054512
复制
发表时间：
2010-08-11
影响因子：
3.7
通讯作者：
Tarucha, S.
中科院分区：
文献类型：
--
作者：
Kanai, Y.;Deacon, R. S.;Tarucha, S.
我们测量了与超导引线耦合的单个InAs自组装量子点（QD）中的非耗散超电流。量子点占用由一个后门电极和一个侧面栅极来调节。侧栅的几何结构允许量子点引线隧道耦合在具有适当轨道状态的恒定电子数区域内进行调谐。我们利用旁门效应研究了近藤相关和超导对在量子点上的相互作用，观察到当近藤温度降至超导能隙以下时，超导电流的减少与理论预测在定性上一致。
We measure the nondissipative supercurrent in a single InAs self-assembled quantum dot (QD) coupled to superconducting leads. The QD occupation is both tuned by a back-gate electrode and lateral side gate. The geometry of the side gate allows tuning of the QD-lead tunnel coupling in a region of constant electron number with an appropriate orbital state. Using the side-gate effect we study the interplay between Kondo correlations and superconducting pairing on the QD, observing a decrease in the supercurrent when the Kondo temperature is reduced below the superconducting energy gap in qualitative agreement with theoretical predictions.