The Kondo effect is a prominent quantum phenomenon describing the many-body screening of a local magnetic impurity. Here, we reveal a new type of nonmagnetic Kondo behavior generated by gauge fluctuations in strongly correlated baths. We show that a nonmagnetic bond defect not only introduces the potential scattering but also locally enhances the gauge fluctuations. The local gauge fluctuations further mediate a pseudospin exchange interaction that produces an asymmetric Kondo fixed point in low energy. The gauge-fluctuation-induced Kondo phenomena do not exhibit the characteristic resistivity behavior of the conventional Kondo effect, but display a nonmonotonous temperature dependence of thermal conductivity as well as an anisotropic pseudospin correlation. Moreover, with its origin from gauge fluctuations, the Kondo features can be regarded as promising indicators for identifying quantum spin liquids. Our work advances fundamental knowledge of novel Kondo phenomena in strongly correlated systems, which have no counterparts in thermal baths within the single-particle description.

中文翻译：

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来自自旋液体中仪表波动的紧急近藤行为

近藤效应是一种突出的量子现象，描述了局部磁性杂质的多体屏蔽。在这里，我们揭示了一种由强相关浴中的规范波动产生的新型非磁性近藤行为。我们表明，非磁性键缺陷不仅会引入潜在的散射，而且还会局部增强规范波动。局部规范波动进一步介导了赝自旋交换相互作用，在低能量下产生不对称的近藤不动点。规范波动引起的 Kondo 现象没有表现出传统 Kondo 效应的特征电阻率行为，但显示出热导率的非单调温度依赖性以及各向异性赝自旋相关性。此外，它起源于轨距波动，Kondo 特征可以被视为识别量子自旋液体的有希望的指标。我们的工作推进了强相关系统中新近藤现象的基础知识，这些系统在单粒子描述中的温泉浴中没有对应物。