  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.
