Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: CE: (General) Theory
TT 8.11: Talk
Monday, March 22, 2010, 16:45–17:00, H21
Influence of Coulomb repulsion on the electron-phonon interaction in high-temperature superconducting copper oxides — •Giorgio Sangiovanni1 and Olle Gunnarsson2 — 1Institut für Festkörperphysik, TU Wien — 2Max-Planck Institut für Festkörperforschung, Stuttgart
The issue of how strong is the electron-phonon interaction in cuprates and how much it influences their properties is not yet settled [1-2]. Whether or not the coupling to, for instance, oxygen bond-stretching modes is sizable cannot be established with standard tools, like those based on plain Local Density Approximation, as this neglects most of the correlation effects. As several sophisticated methods for many-body calculations are now available, it turns out instead that dynamical self-energy effects strongly influence not only the interplay between an instantaneous Coulomb repulsion and a phonon-mediated retarded attraction, but also the very bare estimate of the electron-phonon matrix elements. Using Cluster Dynamical Mean Field Theory and realistic methods beyond Local Density Approximation we can study the electron-phonon interaction in cuprates in an unbiased way.
[1] R. Heid, et al., PRL 100, 137001 (2008)
[2] D. Reznik, el al, Nature 455, E6 (2008)