paper

Piezo-superconductivity: new effects in non-centrosymmetric superconductors

arXiv:2201.06583 · doi:10.1103/PhysRevB.105.134514

Abstract

We study novel effects in non-centrosymmetric superconductors arising from their unique coupling of Cooper-pair condensate and elasticity. We show that although the much discussed Lifshitz coupling is not observable in a uniform bulk state, it strikingly endows dislocations with a fractional magnetic flux. We also predict a generation of voltage-free strain by a DC current in a P and T-breaking Josephson junction. Viewing superconductors through the lens of higher-form symmetries we identify the Lifshitz coupling as a chemical potential for the approximately conserved winding number, drawing an analogy with pyroelectric insulators.

10 pages; a clarification on effects in a vortex lattice

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