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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 E_g channel, which allows a two-component order parameter, whereas the interaction is repulsive in the trivial A_1g channel. The attractive interaction relies on the fact that the E_g 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.