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arXiv 1203.0635cond-mat.str-elcond-mat.stat-mechhep-th
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另一种Kondo击穿机制:轨道选择性正交金属跃迁

Alternative Kondo breakdown mechanism: Orbital-selective orthogonal metal transition

Yin Zhong, Ke Liu, Yong-Qiang Wang, Hong-Gang Luo

摘要:

在Nandkishore和Senthil [arxiv:1201.5998(2012)]最近的一篇论文中,引入了正交金属的概念,将哈伯德模型中的从自旋表象的无序态重新解释为奇异的带隙金属态。我们将这一概念推广到研究扩展Anderson晶格模型中相应的量子相变。发现该模型中从自旋的无序态是一种轨道选择性正交金属,是哈伯德模型中正交金属概念的推广。在量子临界点附近,基本行为由z = 3的临界模式主导,这与哈伯德模型中的朴素期望相反。这一结果为重费米子化合物提供了不同于传统Fermi液体图像下Kondo击穿机制的另一种Kondo击穿机制,该机制是基于轨道选择性正交金属无序态的物理机制.这一工作对于理解某些重费米子材料和其他相关强关联系统中的量子临界性具有重要意义。

英文摘要:

In a recent paper of Nandkishore and Senthil [arxiv:1201.5998 (2012)], a concept of orthogonal metal has been introduced to reinterpret the disordered state of slave-spin representation in the Hubbard model as an exotic gapped metallic state. We extend this concept to study the corresponding quantum phase transition in the extended Anderson lattice model. It is found that the disordered state of slave spins in this model is an orbital-selective orthogonal metal, a generalization of the concept of the orthogonal metal in the Hubbard model. Near the quantum critical point the essential behaviors are dominated by a z = 3 critical mode, which is in contrast to the naive expectation in the Hubbard model. The result provides alternative Kondo breakdown mechanism for heavy fermion compounds underlying the physics of the orbital-selective orthogonal metal in the disordered state, which is different from the conventional Kondo breakdown mechanism with the fractionalized Fermi liquid picture. This work is expected to be useful in understanding the quantum criticality happening in some heavy fermion materials and other related strongly correlated systems.

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