Abstract
We show that the Ginzburg–Landau free energy of a noncentrosymmetric superconductor contains an unusual term which is linear in spatial gradients (the Lifshitz invariant). This can result, in a certain range of parameters, in the superconducting state being nonuniform, even in the absence of a magnetic field. The microscopic origin of the Lifshitz invariant can be traced to the dependence of the pairing interaction on the center-of-mass momentum of the Cooper pairs.
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