1. Materials Science and Engineering; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabia
2. Department of Materials Science and Engineering; University of Texas at Dallas; 800 W. Campbell Rd. RL10 Richardson TX 75080 USA
3. Department of Physics; Southeast University; Nanjing 211189 China
4. Imaging & Characterization Core Lab; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabia