PDOS of the considered systems. (a) α-a , (b) α-b , (c) α-c , (d) β-a , (e) β-b , and (f) β-c . Positive and negative values represent the DOSs projected on the spin up and down, respectively. The Fermi levels are denoted by the vertical dashed line.
Li et al. Nanoscale Research Letters 2012 7:678 doi:10.1186/1556-276X-7-678