1. School of PhysicsHarbin Institute of Technology 92 West Dazhi St. Harbin 150001 China
2. College of Physical Science & TechnologyYangzhou University No.88 South Daxue Rd. Yangzhou 225002 China
3. College of Science & InformationQingdao Agricultural University No.700 Changcheng Rd. Qingdao 266109 China