Rashba-induced Kondo screening of a magnetic impurity in a two-dimensional superconductor

Rashba-induced Kondo screening of a magnetic impurity in a two-dimensional superconductor
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二维超导体中磁性杂质的 Rashba 诱导近藤筛选

DOI:
10.1103/physrevb.97.064519
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发表时间:
2018-02
期刊:
影响因子:
3.7
通讯作者:
Chen Wei Qiang
Chen Wei Qiang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li Lin;Gao Ming Xin;Wang Zhen Hua;Luo Hong Gang;Chen Wei Qiang

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研究了具有Rashba自旋轨道耦合(SOC)的二维超导体中磁性杂质的近藤屏蔽。发现Rashba相互作用产生了一个Kondo屏蔽通道,在该通道中,局域磁矩被不同自旋和轨道态的传导电子的交换耦合屏蔽.与该过程相关的近藤温度由Rashba SOC和超导能隙之间的相互作用决定。结果表明,在这样的系统中,磁二重态和近藤单重态基态之间的量子相变受到Rashba SOC增加的显著影响。这一结果揭示了Rashba SOC的指导作用,并为Kondo效应提供了一个筛选通道,有望在未来的实验中观察到。
We study the Kondo screening of a magnetic impurity in a two-dimensional superconductor with Rashba spin-orbit coupling (SOC). It is found that the Rashba interaction generates a Kondo screening channel, in which the local moment is screened by the exchange coupling with conduction electrons in different spin and orbital states. The Kondo temperature associated with this process is determined by the interplay between the Rashba SOC and superconducting energy gap. As a result, the quantum phase transition between the magnetic doublet and Kondo singlet ground states is significantly affected by increasing Rashba SOC in such a system. This result uncovers that the Rashba SOC plays an instructive role and provides a screening channel for the Kondo effect, which is expected to be observed in future experiments.
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