Scaling and decoherence in the nonequilibrium Kondo model.

Scaling and decoherence in the nonequilibrium Kondo model.
复制标题

非平衡近藤模型中的缩放和退相干。

DOI:
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发表时间:
2004
影响因子:
8.6
通讯作者:
S. Kehrein
S. Kehrein
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
S. Kehrein

文献摘要

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研究了量子点在外加直流偏压下的近藤效应。使用无穷小酉变换(“流方程”)的方法,我们开发了一个微扰标度图像,自然包含平衡相干和非平衡退相干效应。这个框架允许人们研究Kondo效应和电流诱导退相干之间的竞争,它建立了一个由单通道Kondo物理主导的非对称耦合量子点的大区域。
We study the Kondo effect in quantum dots in an out-of-equilibrium state due to an applied dc-voltage bias. Using the method of infinitesimal unitary transformations ("flow equations"), we develop a perturbative scaling picture that naturally contains both equilibrium coherence and nonequilibrium decoherence effects. This framework allows one to study the competition between Kondo effect and current-induced decoherence, and it establishes a large regime dominated by single-channel Kondo physics for asymmetrically coupled quantum dots.