Physics

Current (fluid)

Materials science

Condensed matter physics

Superconductivity

Critical current

Thermodynamics

Physical Review Letters

We study theoretically the nonreciprocal charge transport in two-dimensional noncentrosymmetric superconductors with the Rashba spin-orbit interaction. The resistivity $R$ depends on the current $I$ linearly under the external magnetic field $B$, i.e., $R={R}_{0}(1+\ensuremath{\gamma}BI)$, which is called the magnetochiral anisotropy. It is found that the coefficient $\ensuremath{\gamma}$ is gigantically enhanced by the superconducting fluctuation with the components of both spin singlet and triplet pairings, compared with that in the normal state. This finding offers a method to quantitatively estimate the ratio of the pairing interactions between the singlet and triplet channels including its sign.

Nonreciprocal Current in Noncentrosymmetric Rashba Superconductors