Understand
We show that a film of a semiconductor such as GaAs, in which s-wave superconductivity and a Zeeman splitting are induced by proximity effect, supports zero-energy Majorana fermion modes in the ordinary vortex excitations.
- The key to the topological order is the existence of spin-orbit coupling, coexisting with proximity-induced s-wave superconductivity.
- Since time reversal symmetry is explicitly broken, the edge of the film constitutes a chiral Majorana wire.
- The heterostructure we propose -- a semiconducting thin film sandwiched between an s-wave superconductor and a magnetic insulator -- is a generic system which can be used as the platform for topological quantum computation by virtue of the existence of non-Abelian Majorana fermions.
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