Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W27: Superconductivity:Heavy Fermions
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Kalyan Sasmal, Department of Physics, University of California, San Diego.
Abstract: W27.00011 : Chiral superconductivity in UTe2 via emergent C4 symmetry and spin-orbit coupling
5:00 PM–5:12 PM
Presenter:
Dmitry Chichinadze
(National High Magnetic Field Laboratory)
Authors:
Dmitry Chichinadze
(National High Magnetic Field Laboratory)
Daniel Shaffer
(Emory University)
A lot of attention has been drawn to superconductivity in UTe2, with suggestions of time-reversal symmetry breaking triplet chiral superconducting order parameter. The chirality of the order parameter has been attributed to an accidental near degeneracy of two superconducting components belonging to one-dimensional (1D) irreducible representations (irreps) B2u and B3u of the relevant D2h point group, and it has been argued that the chiral B2u + iB3u combination is selected by ferromagnetic fluctuations. Here we present a possible explanation of the near degeneracy as a result of an accidental C4 symmetry of the band structure, with the superconducting order parameter belonging to the 2D Eu irrep of D4h that uniquely descends to the sought-after B2u + iB3u combination. We show that the C4 symmetry is emergent at the level of the interactions using a renormalization group calculation and argue that the chiral combination of the order parameter is favored when spin-orbit coupling is added to the model.
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