1. College of Chemistry & Chemical Engineering, Harbin Normal University, Harbin 150025, Heilongjiang, P. R. China, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, Heilongjiang, P. R. China, and School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266061, Shandong, P. R. China