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TT: Fachverband Tiefe Temperaturen
TT 63: Superconductivity: Theory
TT 63.9: Talk
Friday, March 31, 2023, 11:45–12:00, HSZ 103
Superconductivity on the honeycomb lattice: A truncated unity perspective — •Matthew Bunney1,2, Jacob Beyer1,2, Carsten Honerkamp2, and Stephan Rachel1 — 1School of Physics, University of Melbourne, Melbourne, Australia — 2Theoretical Solid State Physics, RWTH Aachen University, Aachen, Germany
The honeycomb lattice provides one of the simplest scenarios with sublattice degrees of freedom. For Cooper pairing of electrons on this lattice, this opens extensive and intricate opportunities of interplay between the momentum space wavefunction, the electron spins and the orbital (sublattice) dependencies. Recent advances and improvements in truncated unity versions of the functional renormalization group allows us to fully capture these phenomena. We thus revisit the honeycomb Hubbard model and its electron pairing and density wave instabilities. A particular emphasis is placed on the formation of sublattice singlets and the resulting exotic pairing states.