Quantum dots with even number of electrons: kondo effect in a finite magnetic field
Quantum dots with even number of electrons: kondo effect in a finite magnetic field
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DOI：
10.1103/physrevlett.84.1756
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发表时间：
1999-07
影响因子：
8.6
通讯作者：
Pustilnik;Avishai;Kikoin
中科院分区：
文献类型：
--
作者：
Pustilnik;Avishai;Kikoin
我们证明了在偶数电子的量子点中，外加磁场可以引起近藤效应。如果塞曼能量B接近点中的单粒子能级间距Delta，则传导电子从点的散射由各向异性交换相互作用主导。尽管B远远超过近藤温度T（K），但随后发生近藤共振。因此，在低温T<<T（K）下，微分电导接近于约为e（2）/piPlanck的幺正极限G（K）超过2 π。一个可能的实验实现这种效果进行了讨论。
We show that the Kondo effect can be induced by an external magnetic field in quantum dots with an even number of electrons. If the Zeeman energy B is close to the single-particle level spacing Delta in the dot, the scattering of the conduction electrons from the dot is dominated by an anisotropic exchange interaction. A Kondo resonance then occurs despite the fact that B exceeds by far the Kondo temperature T(K). As a result, at low temperatures T<<T(K) the differential conductance approaches a unitary limit G(K) approximately e(2)/piPlanck's over 2pi. A possible experimental realization of this effect is discussed.