期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.046401
关键词
-
资金
- NSF [0906175]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906175] Funding Source: National Science Foundation
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 feature of three dimensional systems is that there are braidless'' operations in which it is possible to manipulate the ground state 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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