Fig. (2) (a) Density of states with total energy spectrum and (b) band structure for LaOFeAs, where G=(0,0,0), F=(0,1/2,0), Q=(0,1/2,1/2), Z=(0,0,1/2). Three deep inner bands are dominated by hybridization of O-2s, La-5p and As-4s orbitals, respectively. The outer band in the vicinity of Fermi level arisen from the hybridization of O-2p, Fe-3d and As-4p orbitals. The Fermi level is denoted by the dashed line.