Impurity- and magnetic-field-induced quasiparticle states in chiral p-wave superconductors  

作　　者：Yao-Wu Guo Wei Li Yan Chen 

机构地区：[1]Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200333, China [2]State Key Laboratory of Functional Materials for Inforrnatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China [3]CAS Center for Excellence in Superconducting Electronics, Shanghai 200050, China [4]Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

出　　处：《Frontiers of physics》2017年第5期63-70,共8页物理学前沿（英文版）

基　　金：Acknowledgements This work was supported by the National Natural Science Foundation of China （Grant Nos. 11625416 and 11474064）, the State Key Programs of China （Grant No. 2016YFA0300504）, the Strategic Priority Research Program （B） of the Chinese Academy of Sciences （Grant No. XDB04040300）, and the Youth Innovation Promotion Association of the Chinese Academy of Sciences （Grant No. 2016215）.

摘　　要：Both impurity- and magnetic-field-induced quasiparticle states in chiral p-wave superconductors are investigated theoretically by solving the Bogoliubov-de Gennes equations self-consistently. At the strong scattering limit, we find that a universal state bound to the impurity can be induced for both a single nonmagnetic impurity and a single magnetic impurity. Furthermore, we find that different chiral order parameters and the corresponding supercurrents have uniform distributions around linear impurities. Calculations of the local density of states in the presence of an external magnetic field show that the intensity peak of the zero-energy Majorana mode in the vortex core can be enhanced dramatically by tuning the strength of the external magnetic field or pairing interaction.Both impurity- and magnetic-field-induced quasiparticle states in chiral p-wave superconductors are investigated theoretically by solving the Bogoliubov-de Gennes equations self-consistently. At the strong scattering limit, we find that a universal state bound to the impurity can be induced for both a single nonmagnetic impurity and a single magnetic impurity. Furthermore, we find that different chiral order parameters and the corresponding supercurrents have uniform distributions around linear impurities. Calculations of the local density of states in the presence of an external magnetic field show that the intensity peak of the zero-energy Majorana mode in the vortex core can be enhanced dramatically by tuning the strength of the external magnetic field or pairing interaction.

关 键 词：nonmagnetic/magnetic impurity chiral p-wave superconductor vortex state Majorana mode 

分 类 号：O441.1[理学—电磁学] O441.6[理学—物理]