Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots.
Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots.
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DOI：
10.1103/physrevlett.98.047203
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发表时间：
2006-06
影响因子：
8.6
通讯作者：
R. Žitko;J. Bonca
中科院分区：
文献类型：
--
作者：
R. Žitko;J. Bonca
我们研究了由三杂质安德森模型建模的三量子点中的电子跳跃效应。我们确定了系统表现出双通道近藤效应并在较宽温度区间内具有非费米液体特性的跳跃参数范围。当从上方进入该区间时，通过侧点的电导增加到电导量子的一半，而通过系统的电导仍然很小。在较低温度下，当系统跨越费米液体基态时，通过系统的电导增加到单一极限。测量三端配置中的微分电导提供了对 NFL 行为的实验探索。
We study the effect of electron hopping in triple quantum dots modeled by the three-impurity Anderson model. We determine the range of hopping parameters where the system exhibits the two-channel Kondo effect and has non-Fermi-liquid properties in a wide temperature interval. As this interval is entered from above, the conductance through the side dots increases to a half of the conductance quantum, while the conductance through the system remains small. At lower temperatures the conductance through the system increases to the unitary limit as the system crosses over to the Fermi-liquid ground state. Measuring the differential conductance in a three-terminal configuration provides an experimental probe into the NFL behavior.