Thermodynamic Bethe-ansatz equations for the Hubbard chain with an attractive interaction.
Thermodynamic Bethe-ansatz equations for the Hubbard chain with an attractive interaction.
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DOI：
10.1103/physrevb.38.11566
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发表时间：
1988-12
期刊：
影响因子：
--
通讯作者：
Lee;Schlottmann
中科院分区：
文献类型：
--
作者：
Lee;Schlottmann
本文导出了一维Hubbard模型的热力学Bethe-Anonymous方程，该方程适用于电子的相互作用，推广了Takahashi关于排斥性Hubbard链的结果。结果讨论了几个特殊的限制，例如，相互作用远大于跳跃，U.. -->.. 0的情况下，以及高和低温极限。低温下的主要状态由自旋配对电子（类似于库珀对）和这种对的束缚态组成。激发光谱和它的性质进行了讨论的背景下，超导性和共振价键。
The thermodynamic Bethe-ansatz equations for the one-dimensional Hubbard model are derived for an attractive on-site interaction of the electrons, extending in this way Takahashi's result for the repulsive Hubbard chain. The results are discussed in several special limits, e.g., interaction much larger than the hopping, U..-->..0 case, and the high- and low-temperature limits. The dominating states at low temperatures consist of spin-paired electrons (resembling Cooper pairs) and bound states of such pairs. The excitation spectrum and its properties are discussed in the context of superconductivity and resonant valence bonds.