Topological superconductivity by phase tuning
Omri Lesser and Yuval Oreg
Topological superconductivity in one dimension requires time-reversal symmetry breaking, but at the same time, it is hindered by the necessity for large external magnetic fields. We introduce a scheme in which a systematic manipulation of the phases of three superconducting pads tunes the system into a topological state. This scheme requires a tiny field that could be even less than a microtesla or current bias of the phases of the superconductors. The scheme is operational for several platforms and materials, including wires with strong spin-orbit coupling, planar 2D, certain transition metal dichalcogenides, and two layers of 2D systems. If time permits, I will discuss extensions to topological superconductivity in two dimensions based on the same methodology.