Critical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model
Critical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model
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DOI：
10.1103/physrevb.101.014452
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发表时间：
2020-01-31
影响因子：
3.7
通讯作者：
Si, Qimiao
中科院分区：
文献类型：
--
作者：
Cai, Ang;Pixley, J. H.;Si, Qimiao
在重费米子量子临界点（QCP）附近出现的非常规超导激发了对接近“超越朗道”近藤破坏QCP的配对关联的研究。我们专注于一个两个安德森杂质团簇中的近藤破坏诱导的赝能隙的导电电子态密度。通过连续时间量子蒙特卡罗和数值重整化群的分析揭示了一个以前未研究的QCP，既显示了近藤破坏的临界局部矩波动特性，又导致了强烈增强的单重态对磁化率。我们的研究结果提供了深入了解量子临界金属超导性的机制。
The appearance of unconventional superconductivity near heavy-fermion quantum critical points (QCPs) motivates investigation of pairing correlations close to a "beyond Landau" Kondo-destruction QCP. We focus on a two-Anderson-impurity cluster in which Kondo destruction is induced by a pseudogap in the conduction-electron density of states. Analysis via continuous-time quantum Monte Carlo and the numerical renormalization group reveals a previously unstudied QCP that both displays the critical-local moment fluctuations characteristic of Kondo destruction and leads to a strongly enhanced singlet-pairing susceptibility. Our results provide insights into the mechanism for superconductivity in quantum critical metals.