One-dimensional topological superconductivity based entirely on phase control

نویسندگان

چکیده

Topological superconductivity in one dimension requires time-reversal symmetry breaking, but at the same time, it is hindered by external magnetic fields. We offer a general prescription for inducing topological planar superconductor-normal-superconductor-normal-superconductor (SNSNS) Josephson junctions without applying any fields on junctions. Our platform relies two key ingredients: three parallel superconductors form superconductor-normal-superconductor with phase winding, and Fermi velocities spin branches transverse to junction must be different from another. The differences among define parameter plane which includes large regions. analytically derive critical curves where transitions occur corroborate result numerical calculation based tight-binding model. further propose material platforms unequal velocities, establishing experimental feasibility of our approach.

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ژورنال

عنوان ژورنال: Physical Review B

سال: 2022

ISSN: ['1098-0121', '1550-235X', '1538-4489']

DOI: https://doi.org/10.1103/physrevb.106.l241405