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Phys Rev Lett. 2004 Sep 10;93(11):117004. Epub 2004 Sep 10.

Anisotropic electron-phonon interaction in the cuprates.

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Department of Physics, University of Waterloo, Ontario, Canada N2L 3GI.


We explore manifestations of electron-phonon coupling on the electron spectral function for two phonon modes in the cuprates exhibiting strong renormalizations with temperature and doping. Applying simple symmetry considerations and kinematic constraints, we find that the out-of-plane, out-of-phase O buckling mode (B(1g)) involves small momentum transfers and couples strongly to electronic states near the antinode while the in-plane Cu-O breathing modes involve large momentum transfers and couples strongly to nodal electronic states. Band renormalization effects are found to be strongest in the superconducting state near the antinode, in full agreement with angle-resolved photoemission spectroscopy data.

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