Majorana fermions in superconducting nanowires without spin-orbit coupling
Morten Kjaergaard, Konrad Wölms, Karsten Flensberg
DOI 10.1103/PhysRevB.85.020503 · Physical Review B
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Abstract
We study nanowires with proximity-induced s-wave superconducting pairing in an external magnetic field that rotates along the wire. Such a system is equivalent to nanowires with Rashba-type spin-orbit coupling, with strength proportional to the derivative of the field angle. For realistic parameters, we demonstrate that a set of permanent magnets can bring a nearby nanowire into the topologically nontrivial phase with localized Majorana modes at its ends. This occurs even for a magnetic field configuration with nodes along the wire and alternating sign of the effective Rashba coupling.
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