Giant surface Edelstein effect in d-wave superconductors

The Edelstein effect is useful for electric control of the magnetic moment. However, Joule heating created by a dissipative current is harmful to its practical applications. In this paper, we investigate two-dimensional noncentrosymmetric superconductors (NCSs) with either s-wave or d-wave symmetry and demonstrate that the surface Edelstein effect is significantly enhanced in d-wave NCSs. The origin of the enhancement is attributed to surface Majorana states characteristic of gapless spin-singlet noncentrosymmetric superconductors. In the view of superconducting spintronics, this result would give a route to magnetic domain switching by a dissipationless supercurrent. We discuss a possible experimental observation in cuprate superconductor heterostructures and heavy fermion superlattices.