Majorana Fermions and Non-Abelian Statistics in Three Dimensions

Details Majorana Fermions and Non-Abelian Statistics in Three Dimensions Majorana Fermions and Non-Abelian Statistics in Three Dimensions

2009-09-25

arxiv.org/abs/0909.4741v2

Phys. Rev. Lett. 104, 046401 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, published version

Scientific paper

We show that three dimensional superconductors, described within a Bogoliubov de Gennes framework can have zero energy bound states associated with pointlike topological defects. The Majorana fermions associated with these modes have non-Abelian exchange statistics, despite the fact that the braid group is trivial in three dimensions. This can occur because the defects are associated with an orientation that can undergo topologically nontrivial rotations. A new feature of three dimensional systems is that there are "braidless" operations in which it is possible to manipulate the groundstate associated with a set of defects without moving or measuring them. To illustrate these effects we analyze specific architectures involving topological insulators and superconductors.

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