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arXiv · 0804.0888

Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212

W. S. Lee·W. Meevasana·S. Johnston·D. H. Lu·I. M. Vishik·R. G. Moore·H. Eisaki·N. Kaneko·T. P. Devereaux·Z. X. Shen
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Abstract

The temperature dependent evolution of the renormalization effect in optimally-doped Bi2212 along the nodal direction has been studied via angle-resolved photoemission spectroscopy. Fine structure is observed in the real part of the self-energy (Re$Σ$), including a subkink and maximum, suggesting that electrons couple to a spectrum of bosonic modes, instead of just one mode. Upon cooling through the superconducting phase transition, the fine structures of the extracted Re$Σ$ exhibit a two-processes evolution demonstrating an interplay between kink renormalization and superconductivity. We show that this two-process evolution can be qualitatively explained by a simple Holstein model in which a spectrum of bosonic modes is considered.

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W. S. Lee, W. Meevasana, S. Johnston, D. H. Lu, I. M. Vishik, R. G. Moore, H. Eisaki, N. Kaneko, T. P. Devereaux, Z. X. Shen. 2008-04-06. Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212. https://doi.org/10.1103/physrevb.77.140504

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