Universality of the Kondo Effect in Quantum Dots with Ferromagnetic Leads
Universality of the Kondo Effect in Quantum Dots with Ferromagnetic Leads
复制标题
DOI：
10.1103/physrevlett.107.176808
复制
发表时间：
2011-10-19
影响因子：
8.6
通讯作者：
Strunk, Ch.
中科院分区：
文献类型：
--
作者：
Gaass, M.;Huettel, A. K.;Strunk, Ch.
我们研究了近藤区域中带有铁磁性PdNi引线的清洁单壁碳纳米管中的量子点。大多数近藤共振表现出分裂，这取决于与引线的隧道耦合和外部磁场B，但仅微弱地依赖于栅极电压。利用数值重整化群计算，我们证明了数据的所有显著特征都可以用一个简单的铅磁性质模型来理解。零偏压和低温下的磁导普遍依赖于gMu(B)(B-B(C))/k(B)T(K)，其中T(K)是近藤温度，B(C)是补偿分裂的外场。
We investigate quantum dots in clean single- wall carbon nanotubes with ferromagnetic PdNi- leads in the Kondo regime. Most of the Kondo resonances exhibit a splitting, which depends on the tunnel coupling to the leads and an external magnetic field B, but only weakly on the gate voltage. Using numerical renormalization group calculations, we demonstrate that all salient features of the data can be understood using a simple model for the magnetic properties of the leads. The magnetoconductance at zero bias and low temperature depends in a universal way on g mu(B)(B-B(c))/k(B)T(K), where T(K) is the Kondo temperature and B(c) the external field compensating the splitting.