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arXiv 1202.3158cond-mat.str-elmath-phmath.MP
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具有简并局域单粒子本征态的哈伯德模型的性质

Properties of Hubbard models with degenerate localized single particle eigenstates

Andreas Mielke

摘要:

考虑一类单粒子基态具有大简并度的格或图上的排斥哈伯德模型,其中单粒子基态空间的投影是高度可约的.这意味着人们可以在单粒子基态的空间中找到一个基,使得每个单粒子基态的支撑属于某个小簇,并且这些簇不重叠。我们展示了如何在任意维度上构造这种格。我们构造了这些模型的所有多粒子基态,电子数不大于局域单粒子本征态的数目。我们导出了一些基态性质,特别是剩余熵,即零温下的有限熵密度。

英文摘要:

We consider the repulsive Hubbard model on a class of lattices or graphs for which there is a large degeneracy of the single particle ground states and where the projector onto the space of single particle ground states is highly reducible. This means that one can find a basis in the space of the single particle ground states such that the support of each single particle ground state belongs to some small cluster and these clusters do not overlap. We show how such lattices can be constructed in arbitrary dimensions. We construct all multi-particle ground states of these models for electron numbers not larger than the number of localized single particle eigenstates. We derive some of the ground state properties, esp. the residual entropy, i.e. the finite entropy density at zero temperature.

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