Schmid J, Weis J, Eberl K, v Klitzing K
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Phys Rev Lett. 2000 Jun 19;84(25):5824-7. doi: 10.1103/PhysRevLett.84.5824.
Zero-bias anomalies in the conductance through quantum dots have recently been identified as Kondo resonances and explained in terms of the Anderson impurity model. The effect requires a degeneracy and it has been proposed that this should occur for odd electron numbers on the dot. In this paper we present data, obtained on a split-gate quantum dot with a small number of electrons, which are in disagreement with this expectation. The mapping of the Anderson model on the quantum dot is discussed in terms of an interacting N electron system demonstrating why this expectation can fail.
通过量子点的电导中的零偏压异常最近被确认为近藤共振，并根据安德森杂质模型进行了解释。这种效应需要简并性，并且有人提出当量子点上的电子数为奇数时会出现这种情况。在本文中，我们展示了在具有少量电子的分裂栅量子点上获得的数据，这些数据与这一预期不符。从相互作用的N电子系统的角度讨论了安德森模型在量子点上的映射，说明了为什么这一预期可能不成立。
