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arXiv 1304.4454cond-mat.mes-hall
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SU(2)和SU(4)Anderson量子RC电路的导纳

Admittance of the SU(2) and SU(4) Anderson quantum RC circuits

Michele Filippone, Karyn Le Hur, Christophe Mora

摘要:

我们研究的安德森模型作为一个描述的量子RC电路自旋1/2电子和一个单一的水平连接到一个单一的铅。我们的分析依赖于基态的费米液体性质,这固定了低能有效模型的形式。该有效模型的常数是从Anderson模型的Bethe anomalies方程的数值解中提取的。它们使我们能够计算在不同的参数制度的电荷弛豫电阻Rq。在Kondo区域,恢复了Rq随磁场变化的峰值,并证明与以前的数值重整化群结果定量一致。在原子价涨落区域,Rq的峰值持续存在,最大值为h/2e^2,利用微扰理论可以得到解析表达式。我们将我们的分析扩展到SU(4)Anderson模型,在那里我们也导出了电荷弛豫电阻中的一个巨峰的存在。

英文摘要:

We study the Anderson model as a description of the quantum RC circuit for spin-1/2 electrons and a single level connected to a single lead. Our analysis relies on the Fermi liquid nature of the ground state which fixes the form of the low energy effective model. The constants of this effective model are extracted from a numerical solution of the Bethe ansatz equations for the Anderson model. They allow us to compute the charge relaxation resistance Rq in different parameter regimes. In the Kondo region, the peak in Rq as a function of the magnetic field is recovered and proven to be in quantitative agreement with previous numerical renormalization group results. In the valence-fluctuation region, the peak in Rq is shown to persist, with a maximum value of h/2e^2, and an analytical expression is obtained using perturbation theory. We extend our analysis to the SU(4) Anderson model where we also derive the existence of a giant peak in the charge relaxation resistance.

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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