Angle-resolved photoemission spectra of Bi2Sr2CaCu2O8 show a Coulomb coupling ≈ 
1 and an electron-phonon coupling of 2-3

Kulić, M. L.; Dolgov, O. V.

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Angle-resolved photoemission spectra of Bi₂Sr₂CaCu₂O₈ show a Coulomb coupling ≈ 1 and an electron-phonon coupling of 2-3

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Kulić, M. L.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Dolgov, O. V.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kulić, M. L., & Dolgov, O. V. (2007). Angle-resolved photoemission spectra of Bi₂Sr₂CaCu₂O₈ show a Coulomb coupling ≈ 1 and an electron-phonon coupling of 2-3. Physical Review B, 76(13): 132511.

Cite as: https://hdl.handle.net/21.11116/0000-000F-0167-C

Abstract

We show that the double kink structure in the electronic self-energy of Bi2212 near the nodal point at low energy omega(1)approximate to 50-70 meV and at high energy at omega(2)approximate to 0.35-0.4 eV, observed recently in the angle-resolved photoemission spectra (ARPES) measurements can be explained by the electron-phonon interaction (EPI) coupling constant [in the normal part of the self-energy Re Sigma(omega)] lambda(EP)(z)approximate to 2.1 and the Coulomb coupling lambda(C)(z)approximate to 1.1. Additionally, the low-energy slope of the ARPES Re Sigma(omega) at omega < 20 meV by Valla gives a hint that low-energy phonons might contribute significantly to the EPI coupling, i.e., lambda(low,EP)(z)>1, thus giving the total EPI coupling constant lambda(EP)(z,tot)=lambda(EP)(z)+lambda(low,EP)(z)>3. In order to test the role of low-energy phonons by ARPES measurements much better momentum resolution is needed than that reported by Valla Possible pairing scenarios based on ARPES, tunneling, and magnetic neutron scattering measurements are discussed.