Figure 1

(a) Geometric configuration of SNMs with R = 1 and W = 4. The yellow and white balls stand for Si and H atoms, respectively. Energy band structures of SNMs with odd (b) and even (c) W. (d) The band gap of SNM as a function of W with R = 1 and 2. (e) Band gap is plotted versus the quantity (N_removed is the number of removed Si atoms and N_total is equal to the number of atoms before the holes is made in the unit cell). The black line represents a linear fit to the data.