Enhanced triplet superconductivity in noncentrosymmetric systems

TL;DR

This paper investigates how Rashba spin-orbit coupling enhances triplet f-wave superconductivity in noncentrosymmetric systems, revealing the interplay between spin-orbit effects and pairing symmetry.

Contribution

It demonstrates that Rashba spin-orbit coupling promotes triplet f-wave pairing and suppresses singlet pairing in noncentrosymmetric superconductors using the extended Hubbard model.

Findings

Rashba spin-orbit coupling enhances triplet f-wave pairing.

Triplet pairing is increased due to effective interaction enhancement.

Singlet pairing is suppressed by reduced spin susceptibility.

Abstract

We study pairing symmetry of noncentrosymmetric superconductors based on the extended Hubbard model on square lattice near half-filling, using the random phase approximation. We show that d+f-wave pairing is favored and the triplet f-wave state is enhanced by Rashba type spin-orbit coupling originating from the broken inversion symmetry. The enhanced triplet superconductivity stems from the increase of the effective interaction for the triplet pairing and the reduction of the spin susceptibility caused by the Rashba type spin-orbit coupling which lead to the increase of the triplet component and the destruction of the singlet one, respectively.