Size and grain-distribution effects in electronic properties of two-dimensional nanocrystalline rectangle systems

According to the structural characters of real nanostructured systems, a mo del for two-dimensional nanostructured systems has been proposed. By develo ping a renormalization-group Green's function scheme, local electronic dens ity of states at a type of crystallite sites is presented on the pure hoppi ng model. It is found that the changes of all the grain-distribution rules, the average atomic number and the atomic interaction are connected with th e spectral structures of nanostructured systems. However, bule shifts of th e spectra of nanostructured systems seem to be modulated mainly by the chan ges of the bond-parameters which are correlated with the lattice distortion s of the nano-sized grains.