1. Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955−6900, Kingdom of Saudi Arabia
2. Physics and Astronomy Department, King Saud University, Riyadh 11451−2455, Saudi Arabia
3. Department of Physics, National Tsing Hua University, Hsinchu 30010, Taiwan
4. Department of Physics, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia