Unmasking the Origin of Kinks in the Photoemission Spectra of Cuprate Superconductors.
Phys Rev Lett
; 126(14): 146401, 2021 Apr 09.
Article
en En
| MEDLINE
| ID: mdl-33891457
ABSTRACT
The origin of a ubiquitous bosonic coupling feature in the photoemission spectra of high-T_{c} cuprates, an energy-momentum dispersion "kink" observed at â¼70 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.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2021
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Article
País de afiliación:
Estados Unidos