作者单位: | [1]DepartmentofPhysics,ShandongNormalUniversity,Jinan250014 [3]InstituteofTheoreticalphysics,ChineseAcademyofSciences,POBox2735,Beijing100080 [4]DepartmentofPhysics,ShandongNormalUniversity,Jinan250014//DivisionofPhysics,ShandongAgricultureUniversity,Taian271000 |