Dynamical Scaling of Charge and Spin Responses at a Kondo Destruction Quantum Critical Point

Ang Cai*, Zuodong Yu, Haoyu Hu, Stefan Bernd Kirchner, Qimiao Si

*此作品的通信作者

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

Quantum critical points often arise in metals perched at the border of an antiferromagnetic order. The recent observation of singular and dynamically scaling charge conductivity in an antiferromagnetic quantum critical heavy fermion metal implicates beyond-Landau quantum criticality. Here we study the charge and spin dynamics of a Kondo destruction quantum critical point (QCP), as realized in an SU(2)-symmetric Bose-Fermi Kondo model. We find that the critical exponents and scaling functions of the spin and single-particle responses of the QCP in the SU(2) case are essentially the same as those of the large-N limit, showing that 1/N corrections are subleading. Building on this insight, we demonstrate that the charge responses at the Kondo destruction QCP are singular and obey ω/T scaling. This property persists at the Kondo destruction QCP of the SU(2)-symmetric Kondo lattice model.

原文English
文章編號027205
頁(從 - 到)1-5
頁數5
期刊Physical Review Letters
124
發行號2
DOIs
出版狀態Published - 17 1月 2020

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