Dynamical Scaling of Charge and Spin Responses at a Kondo Destruction Quantum Critical Point
Dynamical Scaling of Charge and Spin Responses at a Kondo Destruction Quantum Critical Point
复制标题
近藤破坏量子临界点的电荷和自旋响应的动态缩放
DOI：
10.1103/physrevlett.124.027205
复制
发表时间：
2020
影响因子：
8.6
通讯作者：
Si Qimiao
中科院分区：
文献类型：
--
作者：
Cai Ang;Yu Zuodong;Hu Haoyu;Kirchner Stefan;Si Qimiao
量子临界点经常出现在位于反铁磁序边界的金属中。最近在反铁磁量子临界重费米子金属中观察到的奇异和动态标度的电荷电导率暗示着超越朗道量子临界。本文研究了SU（2）对称玻色-费米近藤模型中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）情形下，QCP的自旋和单粒子响应的临界指数和标度函数与大极限情形下的基本相同，表明修正是次超前的。在此基础上，我们证明了近藤破坏QCP的电荷响应是奇异的和obeyscaling。这种性质在SU（2）对称Kondo晶格模型的Kondo破坏QCP中仍然存在。
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-limit, showing thatcorrections are subleading. Building on this insight, we demonstrate that the charge responses at the Kondo destruction QCP are singular and obeyscaling. This property persists at the Kondo destruction QCP of the SU(2)-symmetric Kondo lattice model.