Impurity effect as a probe for the pairing symmetry of graphene-based superconductors  

作　　者：Yuan-Qiao Li Tao Zhou 

机构地区：[1]College of Science,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006,China [3]Guangdong–Hong Kong Joint Laboratory of Quantum Matter,Frontier Research Institute for Physics,South China Normal University,Guangzhou 510006,China

出　　处：《Frontiers of physics》2021年第4期205-211,共7页物理学前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.12074130);the Science and Technology Program of Guangzhou Province(Grant No.2019050001).

摘　　要：We study theoretically the single impurity effect on graphene-based superconductors.Four different pairing symmetries are discussed.Sharp in-gap resonant peaks are found near the impurity site for the d+id pairing symmetry and the p+ip pairing symmetry when the chemical potential is large.As the chemical potential decreases,the in-gap states are robust for the d+id pairing symmetry while they disappear for the p+ip pairing symmetry.Such in-gap peaks are absent for the fully gapped extended s-wave pairing symmetry and the nodal f-wave pairing symmetry.The existence of the ingap resonant peaks can be explained well based on the sign-reversal of the superconducting gap along different Fermi pockets and by analyzing the denominator of the T-matrix.All of the features may be checked by the experiments,providing a useful probe for the pairing symmetry of graphene-based superconductors.

关 键 词：impurity effect GRAPHENE SUPERCONDUCTIVITY 

分 类 号：O57[理学—粒子物理与原子核物理]