1. Faculty of Physics, TNU-University of Education, Thai Nguyen, Vietnam
2. Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
3. Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Apartado Postal 14, Ensenada, Código Postal 22800, Baja California, Mexico
4. Institute of Theoretical and Applied Research, Duy Tan University, Ha Noi 100000, Vietnam
5. Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam