Spin Density Wave States in Two Dimensional Hubbard Model

概要

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For a wide range of electron filling we study the spin density wave states in the Hub-bard model on a square lattice within a Hartree-Fock ap)croximatiorx. It is shown thatthe incommensurate helical spin density wave states appear for whole region of theelectron filling and, especially, that the commensurate helical spin density wave statewith wave vector (m, 0) is stable near the quarter-filling. We examine also the relativestability of the soliton and the vortex lattice states to the helical spin density wavestates and obtain the results that near the half-filling case the solitort lattice states arestable states for intermediate interaction strength and that the vortex lattice states donot appear as the stable state, except. one particular state with the wixxd-mill spin struc-lure at the quarter-filling.
社団法人日本物理学会の論文
1992-06-15