1. Department of Physics & Astronomy and Center for Computational Sciences
2. Mississippi State University
3. Mississippi 39762
4. USA
5. Department of Physics
6. Kunsan National University
7. Gunsan 54150
8. Republic of Korea
9. Department of Energy Science
10. Sungkyunkwan University (SKKU)
11. Suwon 16419
12. Center for Integrated Nanostructure Physics