| Institution: | 1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;2. Department of Optical Information Science and Technology, Harbin University of Science and Technology, Harbin 150080, China;1. Department of Physics, Chemistry and Mathematics, Alabama A&M University, Normal, AL 35762-7500, USA;2. Department of Mathematics and Statistics, Tshwane University of Technology, Pretoria 0008, South Africa;3. Department of Mathematics, Faculty of Science and Arts, Yozgat Bozok University, 66100 Yozgat, Turkey;4. Science Program, Texas A&M University at Qatar, PO Box 23874, Doha, Qatar;1. Laboratory of Mechanics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;2. Department of Physics, Pondicherry University, Puducherry 605014, India;3. The Abdus Salam International Centre for Theoretical Physics, P.O. Box 586, Strada Costiera 11, I-34014, Trieste, Italy;4. Condensed Matter Laboratory, Department of Physics, Faculty of Science, University of Douala, P.O. Box 24157, Douala, Cameroon |
