1. Department of Electronic Materials Engineering, Research School of Physics, Australian National University, Canberra, Australian Capital Territory 2601, Australia
2. Department of Physics, Jahangirnagar University, Dhaka 1342, Bangladesh
3. Mechanical Engineering Department, Southern Methodist University, Dallas, Texas 75275, United States
4. Department of Electrical, Electronic and Computer Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia