Noise of a Chargeless Fermi Liquid.

Noise of a Chargeless Fermi Liquid.
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无电荷费米液体的噪声。

DOI:
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发表时间:
2017
影响因子:
8.6
通讯作者:
G. Zaránd
G. Zaránd
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
C. P. Moca;C. Mora;I. Weymann;G. Zaránd

文献摘要

被引文献

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我们构造了一个费米液体理论来描述超导体-量子点-正常金属结中靠近量子点的单重态-双重态(宇称变化)的输运。尽管准粒子在这种不带电荷的费米液体中没有确定的电荷,但在粒子-空穴对称的情况下,到安德森模型的映射揭示了隐藏的U(1)对称性和相应的伪电荷。与其他相关的费米液体不同,后向散射噪声揭示了一个等于库珀对电荷的有效电荷,e^{*}=2e。此外,当线性电导为么正时,我们发现对噪声有很强的抑制作用,甚至对其非线性部分也是如此。
We construct a Fermi liquid theory to describe transport in a superconductor-quantum dot-normal metal junction close to the singlet-doublet (parity changing) transition of the dot. Though quasiparticles do not have a definite charge in this chargeless Fermi liquid, in the case of particle-hole symmetry, a mapping to the Anderson model unveils a hidden U(1) symmetry and a corresponding pseudocharge. In contrast to other correlated Fermi liquids, the back scattering noise reveals an effective charge equal to the charge of Cooper pairs, e^{*}=2e. In addition, we find a strong suppression of noise when the linear conductance is unitary, even for its nonlinear part.