Topological Order in the Insulating Josephson Junction Array
Topological Order in the Insulating Josephson Junction Array
We propose a Josephson junction array which can be tuned into an unconventional insulating state by varying external magnetic field. This insulating state retains a gap to half vortices; as a consequence, such array with non-trivial global geometry exhibits a ground state degeneracy. This degeneracy is protected from the effects …