作者单位: | [1]DepartmentofPhysics,SchoolofSciences,BeijingUniversityofPostsandTelecommunications,Beijing100876 [2]DepartmentofTechnicalPhysics,SchoolofPhyslcs,PekingUniversity,Beijing100871 [3]InstituteofTheoreticalPhysics,ChineseAcademyofSciences,Beijing100080 [4]DepartmentofPhysics,SichuanUniversity,Chengdu610064 |