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arXiv 1207.6441cond-mat.str-el
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β- YbAlB4:一种关键节点金属

β-YbAlB4: a critical nodal metal

Aline Ramires, Piers Coleman, Andriy H. Nevidomskyy, A. M. Tsvelik

摘要:

提出了β-YbAlB_4的内禀量子临界模型,在该模型中,动量空间中的涡旋产生了一种新的费米面奇异性.非淬灭的角动量|J = 7/2,m_J = \pm 5/2> Yb 4f态在4f与传导电子的杂化中产生动量空间线缺陷,导致具有k \perp 4色散和与E^{-1/2}成正比的奇异态密度的准二维费米面.我们讨论的影响,这条线节点的动量空间,我们目前的理解量子临界性及其与拓扑结构的相互作用。

英文摘要:

We propose a model for the intrinsic quantum criticality of β-YbAlB4, in which a vortex in momentum space gives rise to a new type of Fermi surface singularity. The unquenched angular momentum of the |J = 7/2,m_J = \pm5/2> Yb 4f-states generates a momentum-space line defect in the hybridization between 4f and conduction electrons, leading to a quasi-two dimensional Fermi surface with a k\perp4 dispersion and a singular density of states proportional to E^{-1/2}. We discuss the implications of this line-node in momentum space for our current understanding of quantum criticality and its interplay with topology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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