Nonequilibrium transport through double quantum dots: Kondo effect versus antiferromagnetic coupling.
Nonequilibrium transport through double quantum dots: Kondo effect versus antiferromagnetic coupling.
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DOI：
10.1103/physrevlett.89.136802
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发表时间：
2002-09
影响因子：
8.6
通讯作者：
Rosa López;R. Aguado;G. Platero
中科院分区：
文献类型：
--
作者：
Rosa López;R. Aguado;G. Platero
本文从理论上研究了双量子点在串联和并联两种构型下的非平衡输运性质。我们的研究结果导致新的实验预测，明确的信号从近藤状态到反铁磁自旋单重态的过渡，直接反映了两个杂质近藤问题的物理。我们证明了通过平行点的非线性电导直接测量点的自旋之间的交换常数J。在连续点中，非线性电导提供了J的上限。
We theoretically study the nonequilibrium transport properties of double quantum dots, in both series and parallel configurations. Our results lead to novel experimental predictions that unambiguously signal the transition from a Kondo state to an antiferromagnetic spin-singlet state, directly reflecting the physics of the two-impurity Kondo problem. We prove that the nonlinear conductance through parallel dots directly measures the exchange constant J between the spins of the dots. In serial dots, the nonlinear conductance provides an upper bound on J.