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

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.