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arXiv 0906.0833cond-mat.str-elcond-mat.supr-con
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用强耦合方法从纯排斥相互作用得到的超导性:SU(2)从转子理论对哈伯德模型的应用

Superconductivity from purely repulsive interactions in the strong coupling approach : Application of the SU(2) slave-rotor theory to the Hubbard model

Ki-Seok Kim, Mun Dae Kim

摘要:

我们提出了一个机制的超导性从纯粹的排斥相互作用中的强耦合制度,BCS(Bardeen-Cooper-Schrieffer)机制,如自旋波动的方法是很难应用。基于哈伯德模型的SU(2)从转子表象,我们发现库珀对振幅形成和相位相干的单个能量尺度被分成两个能量尺度,从而产生了所谓的赝能隙态,其中库珀对是局部相干的,而不是全局相干的,这被解释为密度-相位不确定原理的实现。这种超导状态显示出超流重量的温度线性下降比率,这是由强烈的相位起伏引起的。

英文摘要:

We propose a mechanism of superconductivity from purely repulsive interactions in the strong coupling regime, where the BCS (Bardeen-Cooper-Schrieffer) mechanism such as the spin-fluctuation approach is difficult to apply. Based on the SU(2) slave-rotor representation of the Hubbard model, we find that the single energy scale for the amplitude formation of Cooper pairs and their phase coherence is separated into two energy scales, allowing the so called pseudogap state where such Cooper pairs are coherent locally but not globally, interpreted as realization of the density-phase uncertainty principle. This superconducting state shows the temperature-linear decreasing ratio of superfluid weight, resulting from strong phase fluctuations.

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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