Correlated normal state and topological superconductivity in UTe2

UTe2 poses a promising platform of the paramagnetic end member among the Uranium-based superconductor where spin-triplet pairing superconductivity arises from ferromagnetic fluctuation. Here, we report a theoretical calculation to predict a correlation-driven large Fermi surface (FS) in UTe2, which has a geometry different from those predicted by the previous theoretical studies. The geometry of the FS indicates a robust non-trivial topology of the superconducting state that hosts a Majonara fermion within the weak coupling theory. We also solve the linearized Eliashberg equations in the random phase approximation level considering ferromagnetic spin fluctuation and find the possible superconducting ground state.