Silvestrov P G, Imry Y
Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands.
Phys Rev Lett. 2003 Mar 14;90(10):106602. doi: 10.1103/PhysRevLett.90.106602.
The strong sensitivity of the transmission phase through a quantum dot embedded into one arm of a two-wave Aharonov-Bohm interferometer to the Kondo effect is explained. The enhancement takes place because of the buildup of the exchange scattering on the dot due to Kondo correlations even much above T(K). The enhanced exchange competes with the potential scattering, which is always weak. Both cases of the Anderson impurity model and a multilevel quantum dot are considered. In the latter case in addition to the description of peculiar phase behavior a mechanism leading to ferromagnetic Kondo coupling in quantum dots is proposed.
解释了通过嵌入两波阿哈罗诺夫 - 玻姆干涉仪一臂中的量子点的传输相位对近藤效应的强敏感性。这种增强是由于即使在远高于T(K)时，近藤关联导致量子点上交换散射的积累。增强的交换与总是较弱的势散射相互竞争。考虑了安德森杂质模型和多能级量子点这两种情况。在后一种情况下，除了描述特殊的相位行为外，还提出了一种导致量子点中铁磁近藤耦合的机制。
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