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We analyze the effects of electron-electron interactions and disorder on aRashba double-nanowire setup coupled to an s-wave superconductor, which hasbeen recently proposed as a versatile platform to generate Kramers pairs ofMajorana bound states in the absence of magnetic fields. We identify the regimeof parameters for which these Kramers pairs are stable against interaction anddisorder effects. We use bosonization, perturbative renormalization group, andreplica techniques to derive the flow equations for various parameters of themodel and evaluate the corresponding phase diagram with topological anddisorder-dominated phases. We confirm aforementioned results by considering amore microscopic approach which starts from the tunneling Hamiltonian betweenthe three-dimensional s-wave superconductor and the nanowires. We find againthat the interaction drives the system into the topological phase and, as thestrength of the source term coming from the tunneling Hamiltonian increases,strong electron-electron interactions are required to reach the topologicalphase.

Majorana Kramers pairs in Rashba double nanowires with interactions and disorder