Odd-frequency triplet pairing in mixed-parity superconductors

TL;DR

This paper demonstrates that mixed-parity superconductors can host tunable odd-in-time equal-spin triplet correlations, which depend on the order parameter symmetry and can be generated without magnetic inhomogeneities.

Contribution

It reveals how mixed-parity superconductors exhibit tunable odd-frequency triplet pairing, providing a new way to identify and generate spin-polarized correlations.

Findings

Equal-spin pair correlations are odd-in-time and tunable by an applied field.

The pair correlator's direction and amplitude depend on the order parameter symmetry.

Odd-in-time correlations can be generated without magnetic inhomogeneities at interfaces.

Abstract

We show that mixed-parity superconductors may exhibit equal-spin pair correlations that are odd-in-time and can be tuned by means of an applied field. The direction and the amplitude of the pair correlator in the spin space turn out to be strongly dependent on the symmetry of the order parameter, and thus provide a tool to identify different types of singlet-triplet mixed configurations. We find that odd-in-time spin-polarized pair correlations can be generated without magnetic inhomogeneities in superconducting/ferromagnetic hybrids when parity mixing is induced at the interface.