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arXiv 1408.4935cond-mat.str-elcond-mat.mes-hall
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CNT量子点中双通道近藤效应模型

A Model for Two-Channel Kondo Effect in CNT Quantum Dot

Igor Kuzmenko, Tetyana Kuzmenko, Yshai Avishai

摘要:

过屏蔽近藤效应在碳纳米管量子点结中是可行的,该碳纳米管结中的自旋$\tfrac{1}{2}$原子具有单个$s$波价电子(例如Au)。我们的想法是使用两个谷作为两个对称性保护的味量子数$ξ={\bf K}, {\bf K}'$。微扰RG分析揭示了有限的弱耦合双通道不动点,其中Kondo温度估计为$0.5\div5$ ~K。值得注意的是,发生两种不同的标度制度意味着一个非单调依赖的电导作为温度的函数。

英文摘要:

Over-screened Kondo effect is feasible in carbon nanotube quantum dot junction hosting a spin $\tfrac{1}{2}$ atom with single $s$-wave valence electron (e.g Au). The idea is to use the two valleys as two symmetry protected flavor quantum numbers $ξ={\bf K}, {\bf K}'$. Perturbative RG analysis exposes the finite weak-coupling two-channel fixed point, where the Kondo temperature is estimated to be around $0.5\div5$~K. Remarkably, occurrence of two different scaling regimes implies a non-monotonic dependence of the conductance as function of temperature.

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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