Giant surface Edelstein effect in $d$-wave superconductors

TL;DR

This paper demonstrates a significantly enhanced surface Edelstein effect in $d$-wave noncentrosymmetric superconductors, attributed to surface Majorana states, offering potential for dissipationless magnetic control in superconducting spintronics.

Contribution

It reveals that $d$-wave symmetry in noncentrosymmetric superconductors greatly amplifies the surface Edelstein effect due to Majorana states, advancing superconducting spintronics applications.

Findings

Enhanced surface Edelstein effect in $d$-wave NCSs.

Surface Majorana states are responsible for the enhancement.

Potential for dissipationless magnetic domain switching.

Abstract

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