peerls - hubbard模型的基态和初等激发

Acta Physica Sinica (overseas Edition) Pub Date : 1999-10-01 DOI:10.1088/1004-423X/8/10/007

Shi Yun-long, Zhang Yu-mei, Chen Hong, Wu Xiang

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引用次数: 1

摘要

用高斯波泛函方法研究了peerls - hubbard模型的基态和初等激发。结果表明，由于二聚化斥力和哈伯德斥力同时存在，电荷和自旋自由度相互耦合。在βs2 > 2π区域，自旋间隙ms仍然存在。从基态能量的临界行为推导了哈伯德斥力对二聚化的影响。

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Ground state and elementary excitations of the Peierls-Hubbard model

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 βs2 > 2π 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.

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Acta Physica Sinica (overseas Edition)

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