Unmasking the Origin of Kinks in the Photoemission Spectra of Cuprate Superconductors.
Unmasking the Origin of Kinks in the Photoemission Spectra of Cuprate Superconductors.
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DOI：
10.1103/physrevlett.126.146401
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发表时间：
2021-02
影响因子：
8.6
通讯作者：
Zhenglu Li;Meng Wu;Y. Chan;S. Louie
中科院分区：
文献类型：
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作者：
Zhenglu Li;Meng Wu;Y. Chan;S. Louie
高Tc铜氧化物光电发射谱中普遍存在的玻色子耦合特征，即结合能为1.70 MeV的能量-动量色散“扭结”，其起源至今仍是一个二十年之谜。理解这种现象需要精确描述电子和某些集体模式之间的耦合。本文报道了基于GW微扰理论的从头算计算结果，表明铜氧化物中电子-声子相互作用的关联增强导致了强扭折，这不仅定量地解释了观测结果，而且为实验提供了新的理解。我们的研究结果表明，它是电子态密度的主要因素，在确定的扭结尺寸的掺杂依赖性，表现出的多带性质的铜酸盐，而不是普遍认为它是一个衡量的模式耦合强度。
The origin of a ubiquitous bosonic coupling feature in the photoemission spectra of high-T_{c} cuprates, an energy-momentum dispersion "kink" observed at ∼70 meV binding energy, remains a two-decade-old mystery. Understanding this phenomenon requires an accurate description of the coupling between the electron and some collective modes. We report here ab initio calculations based on GW perturbation theory and show that correlation-enhanced electron-phonon interaction in cuprates gives rise to the strong kinks, which not only explains quantitatively the observations but provides new understanding of experiments. Our results reveal it is the electron density of states being the predominant factor in determining the doping dependence of the kink size, manifesting the multiband nature of the cuprates, as opposed to the prevalent belief of it being a measure of the mode-coupling strength.