Kondo QED：与光超强耦合的双杂质 Anderson 模型中的 Kondo 效应与光子俘获
Kondo QED: The Kondo effect and photon trapping in a two-impurity Anderson model ultra-strongly coupled to light
AI总结：
本文提出结合Kondo效应与光物质超强耦合的“Kondo QED”系统，利用分层运动方程方法发现超强耦合会抑制Kondo共振并引发光子积累效应，为同时控制这两种效应奠定了基础。
摘要：
Kondo 效应是强关联量子多体物理中被研究最多的范例之一。另一种最近才被详细探索（并在实验上变得可及）的强关联物理是光与物质之间的超强耦合。在这里，我们研究了一个我们称之为“Kondo QED”的系统，它结合了这两种现象，由一个与单模腔超强耦合的双杂质 Anderson 模型组成。虽然作为一个抽象模型提出，但它与一系列未来的混合腔 QED 系统相关。使用分层运动方程方法，我们表明腔光子与电子态（杂质）的超强耦合由于 Kondo 云的多体关联被破坏，显著地抑制了电子 Kondo 共振。我们通过计算杂质-腔子系统的熵和互信息，观察到了这种关联从 Kondo 云到腔的转移。此外，在弱导线耦合极限和零偏压下，该模型表现出基态光子积累效应，该效应完全源于杂质-腔相互作用中的反旋转项。有趣的是，在强导线耦合极限下，当增加与导线的杂化时，新跃迁路径的开启使这种积累得到了“Kondo 增强”。这提出了一种从虚态产生真实光子的新机制。我们进一步表明，由于与外部玻色子连续谱的相互作用，Kondo 效应的抑制在腔共振展宽下是稳定的。我们的发现为利用光与物质的超强耦合同时控制 Kondo QED 效应和光子积累效应铺平了道路。
英文摘要：
The Kondo effect is one of the most studied examples of strongly correlated quantum many-body physics. Another type of strongly correlated physics that has only recently been explored in detail (and become experimentally accessible) is that of ultrastrong coupling between light and matter. Here, we study a system which we denote as "Kondo QED") that combines both phenomena, consisting of a two-impurity Anderson model ultra-strongly coupled to a single-mode cavity. While presented as an abstract model, it is relevant for a range of future hybrid cavity-QED systems. Using the hierarchical equations of motion approach we show that the ultrastrong coupling of cavity photons to the electronic states (impurity) noticeably suppresses the electronic Kondo resonance due to the destruction of many-body correlations of the Kondo cloud. We observe this transfer of correlations from the Kondo cloud to the cavity by computing the entropy and mutual information of the impurity-cavity subsystems. In addition, in the weak lead-coupling limit and at zero-bias, the model exhibits a ground-state photon accumulation effect originating entirely from counter-rotating terms in the impurity-cavity interaction. Interestingly, in the strong lead-coupling limit, this accumulation is ``Kondo-enhanced'' by new transition paths opening when increasing the hybridization to the leads. This suggests a new mechanism for the generation of real photons from virtual states. We further show that the suppression of the Kondo effect is stable under broadening of the cavity resonance as a consequence of the interaction to an external bosonic continuum. Our findings pave the way for the simultaneous control of both the Kondo QED effect and a photon accumulation effect using the ultrastrong coupling of light and matter.
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