Bogoliubov Fermi surfaces from pairing of emergent $j=\frac{3}{2}$ fermions on the pyrochlore lattice

S. Kobayashi, A. Bhattacharya, C. Timm, and P. M. R. Brydon


We examine the appearance of superconductivity in the strong-coupling limit of the Hubbard model on the pyrochlore lattice. We focus upon the limit of half-filling, where the normal-state band structure realizes a j=32 semimetal. Introducing doping, we show that the pairing is favored in a J=2 quintet Eg state. The attractive interaction in this channel relies on the fact that Eg pairing on the pyrochlore lattice avoids the detrimental onsite repulsion. Our calculations show that a time-reversal symmetry-breaking superconducting phase is favored, which displays Bogoliubov Fermi surfaces.

Our website uses cookies and Google Analytics to guarantee you the best possible user experience. You can find more information in our privacy policy.