In order to study the pairing symmetry in non-centrosymmetric superconductors, we solve the linearized Éliashberg's equation on the two-dimensional extended Hubbard model in the presence of the Rashba-type spin-orbit coupling (RSOC) within the random phase approximation. In the presence of the RSOC, three types of pairing symmetries appear in the phase diagram with respect to the on-site Coulomb repulsion U and off-site one V. Each of the pairing symmetries is an admixture of the spin-singlet and spin-triplet ones. On the basis of our analytical study, it is found that the admixture of the spin-singlet and spin-triplet components depends on not only the predominant pairing symmetry but also the dispersion relation and pairing interaction.
- Extended Hubbard model
- Pairing symmetry
- Random phase approximation
- Spin-orbit coupling
- Strongly correlated electron system
ASJC Scopus subject areas
- General Physics and Astronomy