arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.4289cond-mat.mes-hallcond-mat.str-el
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单电子晶体管的通用零偏压电导。II:与数值结果的比较

Universal zero-bias conductance for the single electron transistor. II: Comparison with numerical results

Makoto Yoshida, Antonio C. Seridonio, Luiz N. Oliveira

摘要:

本文报道了一种数值重整化群方法,研究了纳米器件中嵌入量子点的零偏压电导。研究结果的光最近推导出的线性映射之间的依赖于温度的电导和通用功能描述的对称安德森模型的电导。已知施加到传导电子的栅极电势显著改变侧耦合到传导路径的量子点的输运性质;在这里讨论的嵌入式几何结构中,类似的电势仅定量地影响电导的温度依赖性。正如预期的那样,在近藤政权的数值结果是在很好的协议与映射电导。在混合价区,映射准确地描述了低温尾部的电导。所示的映射提供了一个统一的看法,在单电子晶体管的传导。

英文摘要:

A numerical renormalization-group survey of the zero-bias electrical conductance through a quantum dot embedded in the conduction path of a nanodevice is reported. The results are examined in the light of a recently derived linear mapping between the temperature-dependent conductance and the universal function describing the conductance for the symmetric Anderson model. A gate potential applied to the conduction electrons is known to change markedly the transport properties of a quantum dot side-coupled to the conduction path; in the embedded geometry here discussed, a similar potential is shown to affect only quantitatively the temperature dependence of the conductance. As expected, in the Kondo regime the numerical results are in excellent agreement with the mapped conductances. In the mixed-valence regime, the mapping describes accurately the low-temperature tail of the conductance. The mapping is shown to provide a unified view of conduction in the single-electron transistor.

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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