1. Institute of Theoretical and Applied Research, Duy Tan University, Ha Noi 100000, Vietnam
2. Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam
3. Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Apartado Postal 14, Ensenada, Baja California, Código Postal 22800, Mexico
4. Faculty of Physics, TNU-University of Education, Thai Nguyen, 250000, Vietnam