Controlling non-Abelian statistics of Majorana fermions on Majorana dimer lattices
arXiv:1012.0561 · doi:10.1103/PhysRevB.84.094505
Abstract
Under appropriate external conditions a semiconductor nanowire in proximity to an s-wave superconductor can be in a topological superconducting (TS) phase. This phase supports localized zero-energy Majorana fermions at the ends of the wire. However, the non-Abelian exchange statistics of Majorana fermions is difficult verify because of the one-dimensional topology of such wires. In this paper we propose a scheme to transport Majorana fermions between the ends of different wires using tunneling, which is shown to be controllable by gate voltages. Such tunneling-generated hops of Majorana fermions can be used to exchange the Majorana fermions. The exchange process thus obtained is described by a non-Abelian braid operator that is uniquely determined by the well-controlled microscopic tunneling parameters.
Final version with 8 pages, 5 figures. A companion paper, arXiv:1012.0296, discusses Majorana exchange through a general junction of three wire segments
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