Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Superconductivity: Theory
TT 22.7: Vortrag
Dienstag, 2. April 2019, 11:15–11:30, H7
Unconventional superconductivity in the 2D Hubbard model: weak-coupling renormalization group — •Sebastian Wolf1, Thomas Schmidt2, and Stephan Rachel1 — 1School of Physics, University of Melbourne, Parkville, VIC 3010, Australia — 2Physics and Materials Science Research Unit, University of Luxembourg, L-1511, Luxembourg
We employ the weak-coupling renormalization group approach to study unconventional superconducting phases emerging in the extended, repulsive Hubbard model on paradigmatic two-dimensional lattices. Repulsive interactions usually lead to higher-angular momentum Cooper pairing. By considering not only longer-ranged hoppings, but also non-local electron-electron interactions, we are able to find superconducting solutions for all irreducible representations on the square and hexagonal lattices, including extended regions of chiral topological superconductivity. For paradigmatic 2D lattices, we provide detailed superconducting phase diagrams as well as the coupling strengths which quantify the corresponding critical temperatures depending on the bandstructure parameters, band filling, and interaction parameters.