In the process of building and optimizing the structure, interesting structure fleshed FIG 5 (a) expanding the cell into 2 * 2 (b) and a supercell constructed, after optimization, the structure shown in Figure 6.
In the process of building and optimizing the structure, the interesting structure leaps to the surface of the paper. Figure 5 (a) expands cell 2 * 2 into (b) and constructs supercell. After optimization, the structure is shown in Figure 6<br>