Chiral superconductivity in UTe2 via emergent C4 symmetry and spin-orbit coupling
Daniel Shaffer, Dmitry V. Chichinadze
DOI 10.1103/PhysRevB.106.014502 · Physical Review B
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Abstract
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. In this work 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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