Perturbation treatment for transport through a quantum dot.
Perturbation treatment for transport through a quantum dot.
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通过量子点传输的微扰处理。
DOI：
10.1103/physrevb.59.12244
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发表时间：
1998
影响因子：
3.7
通讯作者：
K. Kang
中科院分区：
文献类型：
--
作者：
L. Craco;K. Kang
在非平衡态下，采用一种新的微扰方案研究了Anderson杂质的共振隧穿。这种新方法通过在自能中引入可调参数，并对杂质占据数施加自洽，给出了正确的弱耦合极限和强耦合极限。我们发现，零温线性响应电导与精确求和规则得到的电导符合得很好。最近的实验表明，在有限的温度下，电导在近藤谷地出现一个非零极小值。讨论了外加偏压对Kondo和Non-Kondo系统的单粒子态密度和微分电导的影响。
Resonant tunnelling through an Anderson impurity is investigated by employing a new perturbation scheme at nonequilibrium. This new approach gives the correct weak and strong coupling limit in $U$ by introducing adjustable parameters in the self-energy and imposing self-consistency of the occupation number of the impurity. We have found that the zero-temperature linear response conductance agrees well with that obtained from the exact sum rule. At finite temperature the conductance shows a nonzero minimum at the Kondo valley, as shown in recent experiments. The effects of an applied bias voltage on the single-particle density of states and on the differential conductances are discussed for Kondo and non-Kondo systems.