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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Phase separation and electron pairing in repulsive Hubbard clusters
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Phase separation and electron pairing in repulsive Hubbard clusters

机译：排斥哈伯德团簇的相分离和电子配对

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Exact thermal studies of small (4-site and 8-site) Hubbard clusters with local electron repulsion yield intriguing insight into phase separation, charge-spin separation, pseudogaps, condensation, and, in particular, pairing fluctuations away from half-filling. These exact calculations, carried out in canonical and grand canonical ensembles, monitoring variations in temperature T and magnetic field h, show rich phase diagrams in a T-μ. space consisting of pairing fluctuations and signatures of condensation. Corresponding electron pairing instabilities are seen when the on-site Coulomb interaction U is smaller than a critical value U_c(T) and they point to a possible electron pairing mechanism. The specific heat, magnetization, charge pairing, and spin pairing provide strong support for the existence of competing (paired and unpaired) phases near optimal doping in these clusters, and numerous similarities with experiments on high T_c superconductors are pointed out. In addition, these ideas may be linked to superconducting carbon nanotubes where a purely electronic mechanism could be responsible for superconductivity.
机译：对具有局部电子排斥作用的小型（4位和8位）Hubbard团簇的精确热学研究，对相分离，电荷自旋分离，假间隙，缩合，尤其是成对波动（远离半填充）很有兴趣。这些在正则和大正则合奏中进行的精确计算（监视温度T和磁场h的变化）以T-μ表示丰富的相图。由配对波动和凝聚特征组成的空间。当现场库仑相互作用U小于临界值U_c（T）时，可以看到相应的电子配对不稳定性，它们指出了可能的电子配对机理。比热，磁化，电荷配对和自旋配对为这些簇中接近最佳掺杂的竞争（成对和不成对）相的存在提供了有力的支持，并指出了与高T_c超导体实验的许多相似之处。另外，这些想法可能与超导碳纳米管有关，其中纯电子机制可能负责超导。

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