1. Department of Physics, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, United States
2. Department of Materials Science and Engineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, United States
3. Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, United States