An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates

Abstract

Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi2Sr2CaCu2O8+delta reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, which are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches.

5 pages, 3 figures

References in corpus (8)

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• Laser ARPES, the sudden approximation, and quasiparticle-like peaks in Bi2Sr2CaCu2O8+delta
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Cited by in corpus (5)

• Photoemission kinks and phonons in cuprates
• The impact of dynamical screening on the phonon dynamics of LaCuO
• Characteristics of oxygen isotope substitutions in the quasiparticle spectrum of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• The isotope effect in the Hubbard model with local phonons
• Renormalization group approach to anisotropic superconductivity