论文标题
对rkky耦合的两种障碍临近系统的阶段的不对称作用
Asymmetry effects on the phases of RKKY-coupled two-impurity Kondo systems
论文作者
论文摘要
在相关的工作[arxiv：2106.07519]中，我们已经表明，在最对称的情况下，在两种宿主的两种障碍物安德森（2ia）模型中，有两个相对的相位转换或没有。该阶段包括常规的近代和rkky政权以及一种新颖的政权，被解释为近孔稳定的金属量子自旋液体（QSL）。在这里，我们分析了各种类型的不对称性如何影响这张图片。我们证明了对耦合和颗粒孔不对称的跃迁是可靠的，只要电荷转移。尽管在每种杂质上都有散射相移，但这仍然是正确的。最后，对于一个扩展模型，包括主机之间的电荷转移和直接耦合到杂质的宿主位点的小库仑相互作用，我们表明电荷传递的存在会改变相变为交叉。只要托管间跳跃足够小，这会导致在非零温度下的质量相同的物理。讨论了该模型与金属宿主中稀土原子的相关性，并提出了观察我们发现的潜在实验设置。
In a related work [arXiv:2106.07519] we have shown that in the two-impurity Anderson (2iA) model with two hosts coupled by spin exchange in the most symmetric case there are either two phase transitions or none. The phases comprise the conventional Kondo and RKKY regimes and a novel one, interpreted as a Kondo-stabilized, metallic quantum spin liquid (QSL). Here we analyze how various types of asymmetry affect this picture. We demonstrate that the transitions are robust against the coupling and particle-hole asymmetries, provided charge transfer is forbidden. This holds true despite the scattering phase shift at each impurity taking non-universal values. Finally, for an extended model including charge transfer between the hosts and a small Coulomb interaction at the host sites directly coupled to impurities, we show that the presence of charge transfer changes the phase transitions into crossovers. Provided the inter-host hopping is sufficiently small, this leads to qualitatively the same physics at non-zero temperature. The relevance of this model for rare-earth atoms in a metallic host is discussed and potential experimental setups for observing our findings are proposed.
