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arXiv 0812.2977cond-mat.str-el
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一维无限U Hubbard问题及其它模型的精确解

Exact solution of the infinite-U Hubbard problem and other models in one dimension

Brijesh Kumar

摘要:

在开链上精确求解了一个相互作用的自旋费米子模型。在某种表示中,它是无限$U$(局部相互作用)极限中的最近邻哈伯德模型。通过引入幺正变换,将原问题映射到费米子的紧束缚模型上,从而精确求解出其完整的能量本征谱。物理上,精确的解决方案意味着长冈铁磁性的情况下,在基态的任意电子密度。该方法精确地求解了一类非常一般的模型。作为这种酉变换方法的一个应用,还讨论了几个问题。

英文摘要:

An interacting spin-fermion model is exactly solved on an open chain. In a certain representation, it is the nearest-neighbor Hubbard model in the limit of infinite $U$ (local interaction). Exact solution of its complete energy eigen-spectrum is accomplished by introducing a unitary transformation which maps the original problem to a tight-binding model of the fermions only. Physically, the exact solution implies the absence of Nagaoka ferromagnetism in the ground state for arbitrary electron densities. The present method solves a class of very general models exactly. Few more problems are discussed as an application of this unitary transform method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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