Magneto-topological transitions in multicomponent superconductors

Abstract

Multi-component spin-singlet superconductors with competing 0- and $\pi$-pairing couplings, as in $s_{++}$ and $s_{\pm }$ phases, are close to instabilities with a spontaneous breaking of time-reversal symmetry. We demonstrate that the modification of the kinetic energy of superconducting electrons in a doubly connected superconducting cylinder, determined by the applied flux, generally drives transitions from chiral superconducting states to configurations that are time-reversal symmetric. This magneto-topological-induced changeover is investigated by means of a Ginzburg-Landau approach for a two-band superconductor with interband interactions and impurity scattering investigated for the case of a sample in the form of a mesoscopically thin-walled cylinder. We find that the application of a magnetic flux can convert a chiral $s_{\pm }+i{s}_{++}$ state into a $s_{\pm }$ configuration and vice versa or tune the energy splitting of chiral states having inequivalent pairing amplitudes. We discuss signatures for the detection of these phases and of the corresponding transitions in mesoscopic superconducting loops.

12 pages and 4 figures with 4 appendices

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Cited by in corpus (12)

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• Spontaneous time-reversal symmetry breaking by disorder in superconductors
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• Josephson effect and critical currents in trivial and topological full-shell hybrid nanowires
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Optically active Higgs and Leggett modes in multiband pair-density-wave superconductors with Lifshitz invariant
• Spin and orbital Edelstein effect in spin-orbit coupled noncentrosymmetric superconductor
• Magnetic flux induced topological superconductivity in magnetic atomic rings
• The possible frustrated superconductivity in the kagome superconductors
• Examining the possibility of chiral superconductivity in Sr${}_2$RuO${}_4$ and other compounds via applied supercurrent
• Finite-frequency normal and superfluid drag effects in two-component atomic Bose-Einstein condensates