Shot noise in ferromagnet/superconductor junctions with spin-orbit coupling

The role of spin-orbit coupling (SOC) in ferromagnetic/superconductor junction is known to strongly modify the conductance and its anisotropy [1, 2]. However, the influence of SOC on shot noise in such systems remains unexplored. By focusing on the interfacial Rashba SOC, which can counteract the influence of the native potential barrier, it is possible to also understand several trends in the shot noise, calculated in the ballistic regime. While the change of magnetization orientation is found to directly impact shot noise, the resulting bias dependence can be very different from that of conductance. Notably, at zero bias, the complex multi-channel nature of shot noise can be reduced to a single-channel behavior. This work suggests that incorporating SOC into noise spectroscopy could provide a sensitive experimental tool for probing emergent properties in ferromagnet/superconductor junctions.



1. T. Vezin et al. Phys. Rev. B 101, 014515 (2020)

2. R. Cai et al. Nat. Commun. 12, 6275 (2021)