Majorana fermions at the edge of superconducting islands

R. S. Akzyanov, A. L. Rakhmanov, A. V. Rozhkov, Franco Nori

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We investigate the properties of electron states localized at the edge of a superconducting island placed on the surface of a topological insulator in a magnetic field. In such systems, Majorana fermions emerge if an odd number of vortices (or odd multivortex vorticity) is hosted by the island; otherwise, no Majorana states exist. Majorana states emerge in pairs: one state is localized near the vortex core, and another at the island edge. We analyze in detail the robustness of Majorana fermions at the edge of the island threaded by a single vortex. If the system parameters are optimized, the energy gap between the Majorana fermion and the first excited state at the edge is of the order of the superconducting gap induced on the surface of the topological insulator. The stability of the Majorana fermion state against a variation of the gate voltage and its sensitivity to the magnetic field allows one to experimentally distinguish the edge Majorana fermion from conventional Dirac fermions.

Original languageEnglish
Article number075432
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number7
DOIs
Publication statusPublished - 21 Aug 2015
Externally publishedYes

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