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arXiv 1104.5699cond-mat.mes-hall
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铁磁量子点中近藤效应的普适性

Universality of the Kondo effect in quantum dots with ferromagnetic leads

M. Gaass, A. K. Huettel, K. Kang, I. Weymann, J. von Delft, Ch. Strunk

摘要:

我们研究了近藤制度下清洁的单壁碳纳米管中的量子点与铁磁PdNi-铅。在大多数奇数库仑谷的近藤共振表现出明显的分裂,这取决于隧道耦合到引线和外部磁场$B$,只有微弱的栅极电压。使用数值重整化群计算,我们证明,所有的显着特点的数据可以理解使用一个简单的模型的磁性能的铅。在零偏压和低温下的磁导以普遍的方式依赖于$g μ_B (B-B_c) / k_B T_K$,其中$T_K$是近藤温度,而$B_c$是补偿分裂的外部场。

英文摘要:

We investigate quantum dots in clean single-wall carbon nanotubes with ferromagnetic PdNi-leads in the Kondo regime. In most odd Coulomb valleys the Kondo resonance exhibits a pronounced splitting, which depends on the tunnel coupling to the leads and an external magnetic field $B$, and only weakly on 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 $g μ_B (B-B_c) / k_B T_K$, where $T_K$ is the Kondo temperature and $B_c$ the external field compensating the splitting.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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