最近邻Coulomb相互作用对纳米石墨带铁磁基态的影响  

Effects of Nearest-Neighbor Coulomb Interaction on Ferromagnetic Ground State in Nanographite Ribbons

作　　者：朱丽娅[1] 

机构地区：[1]三峡大学理学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2007年第2期187-189,共3页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(10374073)

摘　　要：基于Peierls-extended Hubbard模型,采用Hartree-Fock近似,研究了最近邻Coulomb相互作用V对纳米石墨带铁磁基态稳定性的影响.结果表明,当V增大到某一临界值时,铁磁基态变得不稳定,同时系统从自旋密度波态过渡到电荷密度波态.Based on the Peierls-extended Hubbard model, the effects of the nearest-neighbor.Coulomb interaction on the ferromagnetic ground state in the nanographite ribbons are studied by means of Hartree-Fock ap- proximation. The result shows that if the intersite Coulomb interaction V is larger than a critical value,the ground state is unstable and the transition from the spin-density-wave state to the charge-density-wave state occurs.

关 键 词：Coulomb相互作用 纳米石墨带 铁磁基态 

分 类 号：O482.5[理学—固体物理]