从免疫到猝死：强关联超导体中的强无序效应
From immunity to sudden death: Effects of strong disorder in strongly correlated superconductors
摘要：
研究了强无序对强电子排斥系统的影响。在没有无序的情况下，系统具有d波超导基态，由于其接近莫特绝缘体，具有强的非BCS特征。我们发现，虽然强关联使超导性在这个系统中免疫弱无序，超导性被有效地破坏时，无序强度相当于有效带宽。在强电势波动区域中的电荷运动的抑制导致莫特绝缘贴片的形成，其锚定在它们周围的更大的非超导区域。因此，系统分裂成莫特绝缘区和超导区的岛，安德森绝缘区沿着这些区域的边界出现。因此，电子关联和无序，当两者都很强时，在破坏超导性方面相互帮助，而在弱无序时它们相互竞争。我们的研究结果揭示了为什么锌杂质在破坏铜酸盐的超导电性方面是有效的，即使它对较弱的杂质是稳健的。
英文摘要：
We investigate the effect of strong disorder on a system with strong electronic repulsion. In absence of disorder, the system has a d-wave superconducting ground-state with strong non-BCS features due to its proximity to a Mott insulator. We find that, while strong correlations make superconductivity in this system immune to weak disorder, superconductivity is destroyed efficiently when disorder strength is comparable to the effective bandwidth. The suppression of charge motion in regions of strong potential fluctuation leads to formation of Mott insulating patches, which anchor a larger non-superconducting region around them. The system thus breaks into islands of Mott insulating and superconducting regions, with Anderson insulating regions occurring along the boundary of these regions. Thus, electronic correlation and disorder, when both are strong, aid each other in destroying superconductivity, in contrast to their competition at weak disorder. Our results shed light on why Zinc impurities are efficient in destroying superconductivity in cuprates, even though it is robust to weaker impurities.
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