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Published on: August 2, 2019
Inducing time-reversal-invariant topological superconductivity and fermion parity pumping in quantum wires
Anna Keselman1, Liang Fu, Ady Stern
1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Abstract:
We propose a setup to realize time-reversal-invariant topological superconductors in quantum wires, proximity coupled to conventional superconductors. We consider a model of quantum wire with strong spin-orbit coupling and proximity coupling to two s-wave superconductors. When the relative phase between the two superconductors is ϕ=π a Kramers pair of Majorana zero modes appears at each edge of the wire. We study the robustness of the phase in the presence of both time-reversal-invariant and time-reversal-breaking perturbations. In addition, we show that the system forms a natural realization of a fermion parity pump, switching the local fermion parity of both edges when the relative phase between the superconductors is changed adiabatically by 2π.
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