The Kondo effect in the unitary limit
The Kondo effect in the unitary limit
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DOI：
10.1126/science.289.5487.2105
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发表时间：
2000-09-22
期刊：
影响因子：
56.9
通讯作者：
Kouwenhoven, LP
中科院分区：
文献类型：
--
作者：
van der Wiel, WG;De Franceschi, S;Kouwenhoven, LP
我们在半导体量子点中观察到了强的近藤效应。近藤效应完全克服了电子隧穿的库仑阻塞，电导达到幺正极限值。我们比较了实验近藤温度与自旋1/2安德森杂质模型的理论预测。在近藤政权中发现了极好的一致性。当近藤量子点包含在Aharonov-Bohm环结构的一个臂中时，保持了相位相干性，并且相位行为不同于以前在非近藤量子点上的结果。
We observe a strong Kondo effect in a semiconductor quantum dot when a small magnetic field is applied. The Coulomb blockade for electron tunneling is overcome completely by the Kondo effect, and the conductance reaches the unitary Limit value. We compare the experimental Kondo temperature with the theoretical predictions for the spin-1/2 Anderson impurity model. Excellent agreement is found throughout the Kondo regime. Phase coherence is preserved when a Kondo quantum dot is included in one of the arms of an Aharonov-Bohm ring structure, and the phase behavior differs from previous results on a non-Kondo dot.