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The magnetoresistance of thin superconducting strips subject to aperpendicular magnetic field B and low temperatures T manifests a sequence ofalternating superconductor-insulator transitions (SIT). We study thisphenomenon within a quasi one-dimensional (1D) model for the quantum dynamicsof vortices in a line-junction between coupled parallel SC wires, at parametersclose to their SIT. Mapping the vortex system to 1D Fermions at a chemicalpotential dictated by B, we find that a quantum phase transition of the Isingtype occurs at critical values of the vortex filling, from a SC phase nearinteger filling to an insulator near 1/2-filling. For T->0, the resultingmagnetoresistance R(B) exhibits oscillations similar to the experimentalobservation.

Superconductor-Insulator Magneto-Oscillations in Superconducting Strips