Affiliation: | Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China |