Inducing time-reversal-invariant topological superconductivity and fermion parity pumping in quantum wires.
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.
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Anna
A
Keselman
Liang
L
Fu
Ady
A
Stern
Erez
E
Berg