Topological band and superconductivity in UTe2

Shishidou, Tatsuya; Suh, Han Gyeol; Brydon, P. R.; Weinert, Michael; Agterberg, Daniel F.

doi:10.1103/physrevb.103.104504

Topological band and superconductivity in UTe₂

Journal Article · Fri Mar 05 00:00:00 EST 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.103.104504· OSTI ID:1852380

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Univ. of Wisconsin, Milwaukee, WI (United States); OSTI
Univ. of Wisconsin, Milwaukee, WI (United States)
Univ. of Otago, Dunedin (New Zealand)

UTe₂ is a likely spin-triplet superconductor that also exhibits evidence for chiral Majorana edge states. A characteristic structural feature of UTe₂ is inversion-symmetry related pairs of U atoms, forming rungs of ladders. Here we show how each rung's two sublattice degrees of freedom play a key role in understanding the electronic structure and the origin of superconductivity. In particular, DFT + U calculations generically reveal a topological band near the chemical potential originating from a band inversion associated with 5f electrons residing on these rungs, necessitating a microscopic description that includes these rung degrees of freedom. Furthermore, we show that a previously identified strong ferromagnetic interaction within a U-U rung leads to a pseudospin-triplet superconducting state that accounts for a nonzero polar Kerr angle, the observed magnetic field-temperature phase diagrams, and nodal Weyl fermions. Finally, our analysis may also be relevant for other U-based superconductors.

View Accepted Manuscript (DOE)

Research Organization:: West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0017632

OSTI ID:: 1852380

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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