Dynamical Scaling of Charge and Spin Responses at a Kondo Destruction Quantum Critical Point.,Physical Review Letters

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Dynamical Scaling of Charge and Spin Responses at a Kondo Destruction Quantum Critical Point.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-17 , DOI: 10.1103/physrevlett.124.027205
Ang Cai ₁ , Zuodong Yu _{2,

3} , Haoyu Hu ₁ , Stefan Kirchner _{2,

3} , Qimiao Si ₁

Affiliation

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.

中文翻译：

在近藤破坏量子临界点的电荷和自旋响应的动态缩放。

量子临界点通常出现在反铁磁阶边界处的金属中。最近对反铁磁量子临界重铁金属中电荷电导率进行奇异和动态缩放的观察表明，该现象超出了朗道量子临界。在这里，我们研究在SU（2）对称Bose-Fermi Kondo模型中实现的近藤破坏量子临界点（QCP）的电荷和自旋动力学。我们发现，在SU（2）情况下，QCP的自旋和单粒子响应的临界指数和缩放函数与大N极限的临界指数和尺度函数基本相同，这表明1 / N校正是次导的。基于此见解，我们证明近藤破坏QCP的电荷响应是奇异的，服从ω/ T标度。

更新日期：2020-01-17

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