Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure I
TT 3.10: Vortrag
Montag, 12. März 2018, 12:00–12:15, H 0110
Why Tc is so low in high-Tc cuprates: importance of the dynamical vertex structure — •Motoharu Kitatani1, Thomas Schäfer2,3, Hideo Aoki4, and Karsten Held1 — 1Vienna University of Technology, Vienna, Austria — 2Collège de France, Paris, France — 3École Polytechnique, Palaiseau, France — 4Advanced Industrial Science and Technology (AIST), Ibaraki, Japan
We have applied the dynamical vertex approximation (DΓA), one of the diagrammatic extensions of the dynamical mean field theory (DMFT), for studying d-wave superconductivity in the repulsive Hubbard model on a square lattice. The result well reproduces the cuprate superconducting phase diagram, with a reasonable Tc and a superconducting dome. We have also decomposed the vertex correction contributions to Tc and traced back the dominant scattering processes, and found that local particle-particle diagrams strongly screen the bare interaction near the Fermi level, which act to suppress the pairing interaction. We shall discuss in detail how the dynamical vertex structure passes from the local vertex to the magnetic vertex (spin-fluctuations) to the pairing interaction.