Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Superconductivity: Theory
TT 38.1: Vortrag
Freitag, 9. September 2022, 09:30–09:45, H23
Unconventional superconductivity in the Hubbard model on the pyrochlore lattice — Shingo Kobayashi1, Ankita Bhattacharya2, •Carsten Timm2, and Philip M. R. Brydon3 — 1RIKEN Center for Emergent Matter Science, Saitama, Japan — 2TU Dresden, Germany — 3University of Otago, Dunedin, New Zealand
The Hubbard model on the pyrochlore lattice is studied close to half filling. In the normal state, the band structure realizes a j = 3/2 semimetal. Remarkably, the repulsive Hubbard interaction leads to an attractive superconducting pairing interaction in the Eg channel, which allows a two-component order parameter, whereas the interaction is repulsive in the trivial A1g channel. The attractive interaction relies on the fact that the Eg pairing avoids the detrimental on-site repulsion. The solution of the BCS gap equation shows that a time-reversal-symmetry-breaking superconducting phase is favored, which displays Bogoliubov Fermi surfaces.