Topological stability of Majorana zero-modes in superconductor-topological insulator systems

preprint2010arXivOpen access

Abstract

We derive an index theorem for zero-energy Majorana fermion modes in a superconductor-topological insulator system in both two and three dimensions, which is valid for models with chiral symmetry as well as particle-hole symmetry. For more generic models without chiral symmetry, we suggest that Majorana zero-modes are classified by Z2_2.

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