Correlated normal state fermiology and topological superconductivity in UTe2

UTe 2 is a promising candidate for spin-triplet superconductors, in which a paramagnetic normal state becomes superconducting due to spin fluctuations. Here, we theoretically show that electron correlation induces a dramatic change in the normal state fermiology with an emergent correlated Fermi sur...

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Bibliographic Details
Published in:Communications physics 2024-08, Vol.7 (1), p.273-8, Article 273
Main Authors: Choi, Hong Chul, Lee, Seung Hun, Yang, Bohm-Jung
Format: Article
Language:English
Subjects:
639/766/119/1003
639/766/119/995
Correlation
Electron spin
Fermi surfaces
Ferromagnetic resonance
Ferromagnetism
Low temperature
Parity
Physics
Physics and Astronomy
Resonance
Superconductivity
Superconductors
Topology
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Summary:UTe 2 is a promising candidate for spin-triplet superconductors, in which a paramagnetic normal state becomes superconducting due to spin fluctuations. Here, we theoretically show that electron correlation induces a dramatic change in the normal state fermiology with an emergent correlated Fermi surface (FS) driven by Kondo resonance at low temperatures. This emergent correlated FS can account for various unconventional superconducting properties in a unified way. In particular, the geometry of the correlated FS can naturally host topological superconductivity in the presence of odd-parity pairings, which become the leading instability due to strong ferromagnetic spin fluctuations. Moreover, two pairs of odd-parity channels appear as nearly degenerate solutions which may lead to time-reversal breaking multicomponent superconductivity. The resulting time-reversal-breaking superconducting state is a Weyl superconductor in which Weyl points migrate along the correlated FS as the relative magnitude of nearly degenerate pairing solutions varies. UTe2 is a promising candidate for spin-triplet unconventional topological superconductivity. The authors theoretically show that electron correlation induces a dramatic change in the normal state fermiology of this material with an emergent correlated Fermi surface driven by Kondo resonance at low temperatures, which can account for various unconventional superconducting properties in a unified way.
ISSN:2399-3650
2399-3650
DOI:10.1038/s42005-024-01708-4