Anomalous angle dependence of superconducting diode effect in a mixed spin-orbit coupling system.

In noncentrosymmetric superconductors with strong spin-orbit coupling (SOC), an external magnetic field can induce the superconducting diode effect (SDE) characterized by the helical superconductivity. In this paper, we explore the intrinsic SDE in a superconductor with both Rashba and Dresselhaus SOCs and highlight the role of magnetic field direction in the nonreciprocal helical superconductivity. Numerical results reveal that the magnitude of the field-induced Cooper-pair momentum, which is relevant for the helical superconductivity, exhibits a strong anisotropy when the direction angle of the in-plane magnetic field is varied.

Photoinduced spin-polarized transport and controllable valley-triplet pairing states in a silicene-superconductor junction.

We theoretically investigate the spin-polarized subgap transport and valley-triplet pairing states in a silicene-superconductor junction. By using the nonequilibrium Green's function, it is found that the subgap conductance is strongly affected by the spin polarization induced by an off-resonant circularly polarized light. More importantly, the presence of valley-mixing scattering at the interface could result in a valley-triplet Andreev reflection (AR) process, where the incident electrons and reflected holes come from the same valley.