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We show that a topological phase supporting Majorana fermions can form in a2D electron gas (2DEG) adjacent to an interdigitated superconductor-ferromagnetstructure. An advantage of this setup is that the 2DEG can induce the requiredZeeman splitting and superconductivity from a single interface, allowing one toutilize a wide class of 2DEGs including the surface states of bulk InAs. Wedemonstrate that the interdigitated device supports a robust topological phasewhen the finger spacing lambda is smaller than half of the Fermi wavelengthlambda_F. In this regime, the electrons effectively see a "smeared" Zeemansplitting and pairing field despite the interdigitation. The topological phasesurvives even in the opposite limit lambda>lambda_F/2, though with a reducedbulk gap. We describe how to electrically generate a vortex in this setup totrap a Majorana mode, and predict an anomalous Fraunhofer pattern that providesa sharp signature of chiral Majorana edge states.

Electrical manipulation of Majorana fermions in an interdigitated superconductor-ferromagnet device