Reappearance of the Kondo effect in serially coupled symmetric triple quantum dots
Reappearance of the Kondo effect in serially coupled symmetric triple quantum dots
复制标题
串联耦合对称三量子点中近藤效应的重现
DOI：
10.1209/0295-5075/112/57001
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发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
YiJing Yan
中科院分区：
文献类型：
--
作者：
YongXi Cheng;WenJie Hou;YuanDong Wang;ZhenHua Li;JianHua Wei;YiJing Yan
我们通过层次运动方程 (HEOM) 方法研究了串联耦合三量子点 (STQD) 系统的光谱特性。我们发现，随着点间耦合 t 的增加，由于从单个量子点各自的近藤单重态到三个量子点之间产生的相干键合态的转变，第一次近藤屏蔽之后又出现了另一个近藤效应。近藤效应的再现导致外围QD-1(3)的谱函数呈现三峰结构。通过研究磁化率χ，我们发现中间QD-2的局部磁化率在弱点间耦合时为正值，而在强点间耦合时变为负值，此时STQD系统引起近藤效应的再现。我们还发现，在再现的近藤政权中，低温下的斜率会偏离直线行为。此外，随后详细探讨了温度和点引线耦合强度对重现近藤效应以及近藤相关输运特性的影响。
We investigate the spectral properties of a serially coupled triple quantum dot (STQD) system by means of the hierarchical equations of motion (HEOM) approach. We find that with the increase of the interdot coupling t, the first Kondo screening is followed by another Kondo effect reappearing due to the transition from the respective Kondo singlet state of individual QD to the coherence bonding state generated among the three QDs. The reappearance of the Kondo effect results in the three-peak structure of the spectral functions of peripheral QD-1(3). By investigating the susceptibility χ, we find that the local susceptibility of intermediate QD-2 is a positive value at weak interdot coupling, while it changes into a negative value at strong interdot coupling, at which the STQD system gives rise to the reappearance of the Kondo effect. We also find that the slopes of will deviate from a straight line behaviour at low temperature in the reappearing Kondo regime. In addition, the influence of temperature and dot-lead coupling strength on the reappearing Kondo effect as well as the Kondo-correlated transport properties are afterwards exploited in detail.
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