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Exotic spin, charge and pairing correlations of the two-dimensional doped Hubbard model: A symmetry-entangled mean-field approach

机译:二维掺杂Hubbard模型的外来自旋,电荷和配对相关性:对称纠缠均值场方法

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摘要

Intertwining of spin, charge, and pairing correlations in the repulsive two-dimensional Hubbard model is shown through unrestricted variational calculations, with projected wave functions free of symmetry breaking. A crossover from incommensurate antiferromagnetism to stripe order naturally emerges in the hole-doped region when increasing the on-site coupling. Although effective attractive pairing interactions are identified, they are strongly fragmented in several modes including d-wave pairing and more exotic channels related to an underlying stripe. We demonstrate that the entanglement of a mean-field wave function by symmetry restoration can largely account for interaction effects, and that our approach is exact for a two-site cluster.
机译:斥力二维Hubbard模型中的自旋,电荷和配对相关关系的相互缠绕通过无限制的变分计算得到显示,并且投影波函数没有对称破坏。当增加现场耦合时,在空穴掺杂区域中自然会出现从不相称的反铁磁性到条带状的交叉。尽管已识别出有效的有吸引力的配对相互作用,但它们在几种模式中被强烈分割,包括d波配对和与基础条纹有关的更多奇异通道。我们证明了对称恢复引起的平均场波函数的纠缠可以在很大程度上解释相互作用的影响,并且我们的方法对于两点簇是精确的。

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