Effect of Rashba spin–orbit coupling, magnetization, and mixing of gap parameter on tunneling conductance in F∣NCSC junction of an F∣NCSC∣F spin valve

Abstract

In this paper, we study the quantum transport at the Ferromagnet∣Noncentrosymmetric Superconductor (F∣NCSC) interface of an F∣NCSC∣F spin valve. In this context, we investigate the tunneling conductance and its dependence on Rashba spin–orbit coupling (RSOC) considering different barrier strength and a significant Fermi wavevector mismatch (FWM) at the ferromagnetic and superconducting regions. The study is carried out for different magnetization orientations and strengths. We develop a Bogoliubov–de Gennes (BdG) Hamiltonian, introducing RSOC and exchange interaction for such a hybrid structure. To study charge conductance, we use an extended Blonder–Tinkham–Klapwijk approach along with scattering matrix formalism to calculate the scattering coefficients. Our results strongly suggest that the tunneling conductance is strongly dependent on RSOC, magnetization strength, its orientation, and the FWM. This work has also been done for different singlet–triplet mixings of the gap parameter. We have observed that with the rise of singlet–triplet mixing ratio, the conductance decreases. It is also observed that a transparent barrier with moderate RSOC and magnetization strength with arbitrary orientation is highly suitable for maximum conductance.