Spin-polarized pairing induced by the magnetic field in the Bernal bilayer graphene  

作　　者：黄妍 周涛 Yan Huang;Tao Zhou†(Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter,Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics,Guangdong-Hong Kong Joint Laboratory of Quantum Matter,and Frontier Research Institute for Physics,South China Normal University,Guangzhou 510006,China)

机构地区：[1]Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter,Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics,Guangdong-Hong Kong Joint Laboratory of Quantum Matter,and Frontier Research Institute for Physics,South China Normal University,Guangzhou 510006,China

出　　处：《Chinese Physics B》2024年第4期650-654,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.12074130);the Natural Science Foundation of Guangdong Province (Grant No.2021A1515012340)。

摘　　要：Recent experimental findings have demonstrated the occurrence of superconductivity in Bernal bilayer graphene when induced by a magnetic field.In this study,we conduct a theoretical investigation of the potential pairing symmetry within this superconducting system.By developing a theoretical model,we primarily calculate the free energy of the system with p+ip-wave parallel spin pairing,p+ip-wave anti-parallel spin pairing and d+i d-wave pairing symmetry.Our results confirm that the magnetic field is indeed essential for generating the superconductivity.We discover that the p+ip-wave parallel spin pairing leads to a lower free energy for the system.The numerical calculations of the energy band structure,zero-energy spectral function and density of states for each of the three pairing symmetries under consideration show a strong consistency with the free energy results.

关 键 词：SUPERCONDUCTIVITY magnetic field induction pairing symmetry Bernal bilayer graphene 

分 类 号：TQ127.11[化学工程—无机化工] O469[理学—凝聚态物理]