Topological order in the insulating Josephson junction array

Preprint

8 November 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0211146

Abstract

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.

Keywords

JOSEPHSON JUNCTION ARRAY
INSULATING JOSEPHSON
TOPOLOGICAL ORDER
INSULATING STATE
JUNCTION ARRAY
DEGENERACY
GAPS

All Related Versions

Version 1, 2002-11-08, ArXiv
Published version: Physical Review Letters, 90 (10), 107003.

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