Abstract The ground state and elementary excitations of the Peierls-Hubbard model are studied by using Gaussian wave functional method. The results show that the charge and spin degrees of freedom couple to each other due to the simultaneous existance of the dimerization and Hubbard repulsions. In the region of $\beta$2s>2$\pi$ the spin gap ms is still present. Also the influence of Hubbard repulsions on the dimerization is derived from the critical behavior of ground state energy.
Received: 16 January 1999
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grnat No. 19574040) and the Natural Science Foundation of Shanxi Province (Grant No. 971008), the Foundation for Young-Leaders of Disciplines in Science from Education Commission of Sh
Cite this article:
Shi Yun-long (石云龙), Zhang Yu-mei (章豫梅), Chen Hong (陈鸿), Wu Xiang (吴翔) GROUND STATE AND ELEMENTARY EXCITATIONS OF THE PEIERLS-HUBBARD MODEL 1999 Acta Physica Sinica (Overseas Edition) 8 776
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