1. College of Science; National University of Defense Technology; Changsha 410073 P. R. China
2. College of Aerospace Science and Engineering; National University of Defense Technology; Changsha 410073 P. R. China
3. National Laboratory of Solid State Microstructures; School of Physics; Nanjing University; Nanjing 210093 P. R. China
4. State Key Laboratory of High Performance Computing; National University of Defense Technology; Changsha 410073 P. R. China