A Keldysh derivation shows disordered Rashba superconductors have nonreciprocal fluctuation dynamics: the relaxation rate and noise power acquire a term odd in pair momentum and magnetic field, alongside a universal disorder-independent helical wave vector.
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Kinetic Lifshitz invariants and dynamics of nonreciprocal fluctuations in superconductors
A Keldysh derivation shows disordered Rashba superconductors have nonreciprocal fluctuation dynamics: the relaxation rate and noise power acquire a term odd in pair momentum and magnetic field, alongside a universal disorder-independent helical wave vector.