Kondo transport through serially coupled triple quantum dots
Kondo transport through serially coupled triple quantum dots
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DOI：
10.1103/physrevb.72.045332
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发表时间：
2005-07-01
影响因子：
3.7
通讯作者：
Wang, YP
中科院分区：
文献类型：
--
作者：
Jiang, ZT;Sun, QF;Wang, YP
从理论上研究了串联耦合三重量子点（包括一个中间点和两个外围点）的平衡和非平衡近藤输运性质。由于近藤共振被点间耦合以非平凡的方式强重整化，零偏压电导显示出不对称的双峰图案，这与库仑制度中TQD器件中出现的单电导峰图案显著不同。此外，在有限偏置的情况下，电流与偏置显示出一个峰值，并观察到一个相对较大的负微分电导。此外，我们还研究了近藤自旋单态与普通裸态的叠加，发现它们虽然属于不同的态，但仍有很强的混合。
The equilibrium and nonequilibrium Kondo transport properties of the serially coupled triple quantum dots (TQD's), including one intermediate dot and two peripheral dots, were studied theoretically. As the Kondo resonance is strongly renormalized in a nontrivial manner by the interdot coupling, the zero-bias conductance shows an asymmetrical double-peak pattern, which is significantly different from the single-conductance-peak pattern that appeared in the TQD device in the Coulomb regime. Furthermore, in the finite-bias case, the current versus the bias shows a peak and a relatively large negative differential conductance is observed. In addition, the superposition of the Kondo spin singlet and the usual naked state is also investigated and strong mixture between them is observed even though they belong to different kinds of states.