论文标题

多极围绕问题中非Fermi液体固定点的上升和下降

Rise and Fall of Non-Fermi Liquid Fixed Points in Multipolar Kondo Problems

论文作者

Schultz, Daniel J., Patri, Adarsh S., Kim, Yong Baek

论文摘要

最近,结果表明,多极围绕的问题,其中携带高级多极矩与传导电子相互作用的量子杂质导致了新型的非FERMI液态态。由于局部矩的多极特性,与传导电子相互作用的形式很大程度上取决于通过晶体对称性约束传导电子的轨道对称性。这表明,根据传导电子的特征,可能存在多种不同的非Fermi液态。在这项工作中,使用重新归一化组分析,我们研究了一个模型,其中多极局部矩与具有两个不同轨道对称组件的传导电子,即$ p $ - 波和$ f $ - 波对符号。当单独存在每个轨道对称成分时,出现具有相同热力学奇异性的非Fermi液态。但是,当允许两个轨道对称成分时,通过混合散射通道中的量子波动出现了完全不同的非Fermi液态。这一出色的结果表明,多极围绕问题为发现意外的非Fermi液态态带来了新的机会。

Recently it was shown that the multipolar Kondo problem, wherein a quantum impurity carrying higher-rank multipolar moments interacts with conduction electrons, leads to novel non-Fermi liquid states. Because of the multipolar character of the local moments, the form of the interaction with conduction electrons is strongly dependent on the orbital-symmetry of the conduction electrons via crystalline symmetry constraints. This suggests that there may exist a variety of different non-Fermi liquid states in generic multipolar Kondo problems depending on the character of conduction electrons. In this work, using renormalization group analysis, we investigate a model where the multipolar local moment is coupled to conduction electrons with two different orbital-symmetry components, namely $p$-wave and $f$-wave symmetries. When each orbital-symmetry component is present alone, non-Fermi liquid states with exactly the same thermodynamic singularities appear. When both orbital-symmetry components are allowed, however, a completely different non-Fermi liquid state arises via the quantum fluctuations in the mixed scattering channels. This remarkable result suggests that the multipolar Kondo problem presents novel opportunities for the discovery of unexpected non-Fermi liquid states.

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