Amplitude, density, and current correlations of strongly disordered superconductors
Amplitude, density, and current correlations of strongly disordered superconductors
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DOI：
10.1103/physrevb.92.064512
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发表时间：
2015-04
影响因子：
3.7
通讯作者：
G. Seibold;L. Benfatto;C. Castellani;J. Lorenzana
中科院分区：
文献类型：
--
作者：
G. Seibold;L. Benfatto;C. Castellani;J. Lorenzana
我们调查的静态密度，振幅和电流的相关性内的有吸引力的哈伯德模型补充现场无序的无序依赖。研究发现，由于超导岛的形成，强无序有利于密度和振幅关联的解耦。这种紧急粒度也诱导增强的密度相关性的SC岛，而振幅波动是最明显的“绝缘”区域。虽然密度和振幅的相关性是短期的强无序，我们表明，电流的相关性有一个长期的尾巴，由于形成的discriative电流路径与恒定的行为预期从一维模型的分析。
We investigate the disorder dependence of the static density, amplitude, and current correlations within the attractive Hubbard model supplemented with onsite disorder. It is found that strong disorder favors a decoupling of density and amplitude correlations due to the formation of superconducting (SC) islands. This emergent granularity also induces an enhancement of the density correlations on the SC islands whereas amplitude fluctuations are most pronounced in the ``insulating'' regions. While density and amplitude correlations are short ranged at strong disorder, we show that current correlations have a long-range tail due to the formation of percolative current paths in agreement with the constant behavior expected from the analysis of one-dimensional models.