Tunneling currents in ferromagnetic systems with multiple broken symmetries

TL;DR

This paper investigates how multiple broken symmetries in ferromagnetic systems, including spin, superconducting, and spatial inversion symmetries, influence tunneling currents, with potential for external control of quantum phenomena.

Contribution

It introduces a theoretical analysis of tunneling currents in systems with coexisting broken symmetries, combining ferromagnetism, superconductivity, and spin-orbit coupling effects.

Findings

Tunneling currents are affected by multiple broken symmetries.

External parameters can influence tunneling phenomena.

Analysis applies to specific ferromagnetic and superconducting junctions.

Abstract

SHORTENED ABSTRACT: A system exhibiting multiple simultaneously broken symmetries offers the opportunity to influence physical phenomena such as tunneling currents by means of external control parameters. In this paper, we consider the broken SU(2) (internal spin) symmetry of ferromagnetic systems coexisting with \textit{i)} the broken U(1) symmetry of superconductors and \textit{ii)} the broken spatial inversion symmetry induced by a Rashba term in a spin-orbit coupling Hamiltonian. In order to study the effect of these broken symmetries, we consider tunneling currents that arise in two different systems; tunneling junctions consisting of non-unitary spin-triplet ferromagnetic superconductors and junctions consisting of ferromagnets with spin-orbit coupling.