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Photoemission from a system of localized pairs on a cuprate lattice

机译:来自铜酸盐晶格上的局部对系统的光发射

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摘要

We postulate that the anisotropic normal-state gap seen recently in cuprates may be the result of pre-formed pairs and use a one-step Green function method to analyse a model in which the normal state consists of a non-degenerate system of such pairs. We observe that, for a completely localized pair band, an angularly independent peak is obtained with a width equal to the single-electron bandwidth. The peak, rather than corresponding to a Feint on the single-electron energy surface, is in fact a result of the collective contribution from all pairs and is mathematically similar to a Van Hove singularity. The relation of this calculation to the available angle resolved photoemission spectroscopy data and proposals for further research are discussed.
机译:我们假设最近在铜价中看到的各向异性常态间隙可能是预先形成的配对的结果,并使用一步格林函数方法分析了一个模型,其中正常状态由此类的非退化系统组成。我们观察到,对于完全局部化的对带,获得了角度独立的峰,其宽度等于单电子带宽。实际上,该峰而不是对应于单电子能量表面上的Feint,而是所有对的集体贡献的结果,并且在数学上类似于Van Hove奇点。讨论了该计算与可用角度分辨光发射光谱数据之间的关系,并提出了进一步研究的建议。

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