Topology and persistent spin currents in superconducting altermagnets

Marcel Franz, UBC

At low temperature, altermagnetic metals can naturally support spin-triplet superconducting phases with, effectively, independent condensates for spin-up and spin-down electrons. I will show that such a state exhibits non-trivial topology. In addition it can be used to both generate and carry spin-polarized persistent currents that are of interest to spintronic applications. Theses conclusions apply to altermagnets that become intrinsically superconducting at low temperatures, but, remarkably, also to the case when an altermagnet is proximitized with a conventional spin-singlet s-wave superconductor.

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