California Institute of Technology

Starting from an ab-initio description of monolayer altermagnet V2Se2O, the authors build a low-energy model of its spin-split Fermi surface and perform self-consistent Bogoliubov–de Gennes calculations for a V2Se2O/conventional s-wave superconductor stack, finding that the momentum-dependent exchange splitting favors equal-spin pairing and converts the proximity-induced order into a fully gapped p-wave state whose Bogoliubov–de Gennes bands carry a nonzero first Chern number over a broad range of interface parameters, with slab spectra showing chiral Majorana edge modes traversing the bulk gap, and they further quantify how the inverse proximity effect shapes the induced gap across a finite multilayer stack.

Starting from an ab-initio description of monolayer altermagnet V2Se2O, the authors build a low-energy model of its spin-split Fermi surface and perform self-consistent Bogoliubov–de Gennes calculations for a V2Se2O/conventional s-wave superconductor stack, finding that the momentum-dependent exchange splitting favors equal-spin pairing and converts the proximity-induced order into a fully gapped p-wave state whose Bogoliubov–de Gennes bands carry a nonzero first Chern number over a broad range of interface parameters, with slab spectra showing chiral Majorana edge modes traversing the bulk gap, and they further quantify how the inverse proximity effect shapes the induced gap across a finite multilayer stack.