A Short Review of the S4 Symmetric Microscopic Model for Iron-Based High Temperature Superconductors

10th International Conference on Materials and Mechanisms of Superconductivity

Hu, Jiangping^1,2

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China^1

Department of Physics, Purdue University, West Lafayette, IN 47907, United States^2

关键词: High Tc superconductors;    Iron-based high temperature superconductor;    Low-energy physics;    Magnetically ordered state;    Microscopic modeling;    Pairing symmetries;    Quantum Monte Carlo simulations;    Repulsive interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012017/pdf
DOI  :  10.1088/1742-6596/449/1/012017

来源: IOP

【 摘 要 】

We briefly review the recently constructed two orbital microscopic model for iron-based superconductors based on S4 symmetry[1]. With this faithful representation of the kinematics of the tri-layer FeAs or FeSe structure, the model provides answers and physical pictures to fundamental questions related to the robustness of superconductivity and pairing symmetry, unifies different families of iron-based superconductors, casts new insight into the connections to the other high Tc superconductors, cuprates, and reveals why an s-wave pairing can be stabilized by repulsive interactions. Further progresses include that the model provides a clean understanding of band reconstruction observed in magnetically ordered states, which is a strong support to the kinematics of the S4 model, and captures the essential low energy physics of iron-based superconductors based on numerical results from unbiased quantum Monte Carlo simulation.