The Superconductivity of UTe2

The spin-triplet superconductor UTe2 has recently emerged as a rich system that incorporates aspects of unconventional superconductivity, heavy-electron physics and non-trivial topologies. Superconductivity in UTe2 is characterized by enormous upper critical fields that exceed the paramagnetic limit and re-enter in ultra-high fields, nodal quasiparticle excitations, chiral in-gap surface states, and multiple distinct superconducting phases that span regimes of temperature, magnetic field and applied pressure. Superconductivity emerges from a renormalized electronic structure of hybridized f-electrons which give rise to archetypal heavy fermion features such as an enhanced quasiparticle heat capacity and hybridization gap, yet key questions about the nature of magnetism, electronic structure, order instabilities and sample dependence remain. This talk will review the evidence for odd-parity superconductivity in UTe2 and the evolution of experimental results that shed light on the superconductivity of UTe2, with an emphasis on experimental probes of quasiparticle degrees of freedom and order parameter symmetry.