Majorana fermions at odd junctions in a wire network of ferromagnetic impurities
Kristofer BjörnsonDepartment of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, SwedenAnnica M. Black‐SchafferDepartment of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
2016en
ABI
Abstract
We consider a wire network of ferromagnetic impurities on the surface of an $s$-wave superconductor with a strong Rashba spin-orbit interaction. Within the topological phase, zero-energy Majorana fermions appear at the wire end points as well as at junctions between an odd number of wire segments, while no clearly isolated subgap states are present at junctions between an even number of wire segments, providing strong, experimentally accessible signatures for Majorana fermions. We also investigate the quasiparticle energy gap with respect to varying the Rashba spin-orbit coupling and magnetic impurity strength.
Identifiers
Citations and references
Cited by 20 references