Unconventional Superconductivity in UTe2

UTe₂ has emerged as one of the most intriguing unconventional superconductors discovered in recent decades. Since its initial identification, accumulating evidence has pointed toward spin-triplet pairing and an exceptionally rich phase diagram. The material exhibits remarkable responses to magnetic field, including re-entrant superconductivity, as well as multiple distinct superconducting phases stabilized under different tuning conditions. In parallel, theoretical and experimental efforts have increasingly highlighted the potential for nontrivial topology in its superconducting state. In this talk, six years after the initial discovery, I will review the current status of our understanding of UTe₂. I will discuss what is known—and what remains debated—regarding its pairing symmetry, the nature of its multiple superconducting phases, and the possible topological character of the superconducting state.