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Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
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We propose heterostructures that realize first and second order topological superconductivity with vanishing net magnetization by utilizing altermagnetism. Such platforms may offer a significant improvement over conventional platforms with uniform magnetization since the latter suppresses the superconducting gap. We first introduce a 1D semiconductor-superconductor structure in proximity to an altermagnet which realizes end Majorana zero modes (MZMs) with vanishing net magnetization. Additionally, a coexisting Zeeman term provides a tuning knob to distinguish topological and trivial zero modes. We then propose 2D altermagnetic platforms that can realize chiral Majorana fermions or higher order corner MZMs. Our work paves the way towards realizing Majorana boundary states with an alternative source of time-reversal breaking and zero net magnetization.
Forward citations
Cited by 2 Pith papers
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Unconventional superlattice ordering in intercalated transition metal dichalcogenide V$_{1/3}$NbS$_2$
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On the Symmetries of Anisotropic Spin Interaction Models
Anisotropic spin models can have exact symmetry groups outside O(3)xIsom(R^3), enforced by cohomology twists, and can host Z2 quadrupolar excitations on a spin Brillouin Klein bottle.
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