LAUSR

Using semiclassical Boltzmann transport theory, we predict a current-induced spin polarization in Weyl semimetals, similar to the Edelstein effect of surface states in Rashba systems or in topological insulators. The theory is applied to the Weyl semimetal TaAs, for which we estimate the magnitude of the effect. The main contribution comes from the topological surface states, i.e., the Fermi arcs, which provide an enormous current-induced spin polarization enhanced by at least one order of magnitude in comparison to Rashba systems and the surface states of topological insulators.