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Structural,electronic and magnetic properties of La-,Ce-,Pr-,Nd-,Pm-,Sm-and Eu-doped β-graphyne are investigated by comprehensive ab initio calculation based on density functional theory.The adsorption energies indicate that the dopings are suitable.The dopedβ-graphyne undergoes transition from semiconductor to metal.Furthermore,the doping of Nd,Pm,Sm and Eu atoms can induce magnetization.The results are useful for spintronics and the design of future electronic devices.