A Model of Strongly Correlated Electrons with Condensed Resonating-Valence-Bond Ground States
A Model of Strongly Correlated Electrons with Condensed Resonating-Valence-Bond Ground States
复制标题
具有凝聚共振价键基态的强相关电子模型
DOI：
10.1088/0305-4470/37/5/007
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Tanaka
中科院分区：
文献类型：
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作者：
A. Tanaka
我们提出了一个新的强相关电子的精确可解模型。该模型基于CuO2平面的d-p模型，该模型在cu位点上具有无限大的排斥相互作用，并且包含额外的相关跳变、对跳变和电子的电荷-电荷相互作用。对于小于或等于2/3填充的偶数电子，我们构建模型的精确基态，它们都具有相同的能量，并且每个都是固定电子数的唯一基态。结果表明，这些基态是共振价键态，也被认为是所有电子都处于单一双电子态的凝聚态。我们还证明了基态表现出非对角线的长程有序。
We propose a new exactly solvable model of strongly correlated electrons. The model is based on a d–p model of the CuO2 plane with infinitely large repulsive interactions on Cu-sites, and it contains additional correlated-hopping, pair-hopping and charge–charge interactions of electrons. For even numbers of electrons less than or equal to 2/3-filling, we construct the exact ground states of the model, all of which have the same energy and each of which is the unique ground state for a fixed electron number. It is shown that these ground states are the resonating-valence-bond states which are also regarded as condensed states in which all electrons are in a single two-electron state. We also show that the ground states exhibit off-diagonal long-range order.