Higher-order topological superconductors host Majorana zero modes localized at corners or hinges, providing a promising route toward scalable and controllable Majorana networks without vortices or magnetic flux. Here we propose a symmetry-enforced higher-order topological superconductivity based on antiferromagnetic topological insulators, specifically realized in $\mathrm{Mn}X{\mathrm{Pb}}_2\text{-Pb}$ ($X$ = Se, Te) heterostructure. We show that the intrinsic boundary dichotomy—gapless Dirac states protected by an effective time-reversal symmetry on antiferromagnetic edges and magnetic gaps on ferromagnetic edges—naturally generates Majorana corner modes as mass domain walls. Superconducting proximity converts the antiferromagnetic edges into one-dimensional topological superconductors, and the intersections between superconducting and magnetic edges bind Majorana zero modes as mass domain walls. Combining first-principles calculations with a calibrated effective boundary theory, we demonstrate robust corner localization and purely electrical control of Majorana fusion and braiding in a triangular geometry. Our results establish $\mathrm{Mn}X{\mathrm{Pb}}_2$ as an experimentally promising platform for electrically programmable Majorana networks in two dimensions.

Close

PrevNext

View figure in article

• Magnetic order
• Proximity effect
• Spin-orbit coupling
• Topological edge modes
• Topological insulators
• Topological superconductors
• Topological materials
• Electron-correlation calculations