Local Kondo entanglement and symmetry protected local criticality in the two-impurity Kondo problem

International Conference on Strongly Correlated Electron Systems 2016

Li, Yuxiang^1 ; Feng, Xiao-Yong^1 ; Dai, Jianhui^1

Department of Physics, Hangzhou Normal University, Hangzhou

310036, China^1

关键词: Conduction electrons;    Kondo lattice model;    Kondo models;    Kondo problems;    Localized magnetic moments;    Numerical renormalization groups;    Singlet state;    Spin symmetry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/3/032004/pdf
DOI  :  10.1088/1742-6596/807/3/032004

来源: IOP

【 摘 要 】

The local Kondo entanglement is defined as the concurrence of a short-ranged Kondo singlet state consisting of a localized magnetic moment and a nearby conduction electron. We derive the entanglement phase diagram of the Rasul-Schlottmann model, the effective spin-only Hamiltonian for the two-impurity Kondo model in the numerical renormalization group approach. We show that the local Kondo entanglement vanishes exactly at the two-impurity Kondo critical point, associated concomitantly with a jump in the inter-impurity entanglement. We discuss how to generalize this result to a Kondo lattice model preserving the same enhanced spin symmetry.