Superinsulator as a phase of bi-particle localized states

Abstract

We propose a physical picture of superinsulator observed recently in experiments with superconducting films in a magnetic field. On the basis of previous numerical studies we argue that a moderate attraction creates bi-particle localized states at intermediate disorder strength when noninteracting electron states are delocalized and metallic. Our present numerical study show that such localized pairs are broken by a static electric field which strength is above a certain threshold. We argue that such a breaking of localized pairs by a static field is at the origin of superinsulator breaking with a current jump observed experimentally above a certain critical voltage.

revtex, 8 pages, discussion and fig added

References in corpus (6)

• Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
• Jumps in current-voltage characteristics in disordered films
• Collective transport in the insulating state of Josephson junction arrays
• Scale dependent superconductor-insulator transition
• Cooper pairs under the action of disorder and strong magnetic field
• dc Conductivity of an array of Josephson junctions in the insulating state