Topological order in the insulating Josephson junction array

Details Topological order in the insulating Josephson junction array Topological order in the insulating Josephson junction array

2002-11-07

arxiv.org/abs/cond-mat/0211146v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTex 4, 1 EPS figure

Scientific paper

10.1103/PhysRevLett.90.107003

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 of external noise. We compute the gaps separating higher energy states from the degenerate ground state and we discuss experiments probing the unusual properties of this insulator.

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